Module A-138d can be used in two different ways:
- as a crossfader module within the A-100
- as an insert module for external effect units (e.g. guitar stomp boxes) with dry/wet control
If the module is used as a crossfader within the A-100 the two audio signals are connected to the sockets In 1 and In 2. The position of the CF (Crossfade) control defines the relation between the levels of the signals In 1 and In 2 that appear at the Mix Output. In the leftmost position of CF only In 1 appears at the output, in the rightmost position only In 2. In the center position both inputs appear with the same level at the Mix Output. Each input is equipped with two sockets (miniature multiples) so that the input signals can be forwarded to other modules too. Even the Mix Output has two sockets available. The mute switch can be used to mute In 1 or In 2 independent of the position of the crossfade control. In the center position it has no function. The controls Atten. and Amp. and the 1/4" sockets FX Send and FX Return are not used in this application.
If the module is used as an effect send/return module with dry/wet control the A-100 signal that has to be processed by the external effect unit is connected to In 1. The signal can be attenuated by control Atten. before it is output to the 1/4" socket FX Send. The attenuator has been added because some effect units without input level control (especially guitar stomp boxes) will distort with A-100 levels (~ 1 Vss or more). The attenuator can be used to reduce the signal level so that no distortion occurs. Atten. is adjusted so that the external effect unit does not distort. The output of the external effect unit is connected to the 1/4" socket FX Return. This socket is followed by an amplifier and the control Amp. is used to amplify the signal to obtain again A-100 audio level (~ 1Vss or more). Amp is adjusted so that the loudness of both signals (i.e. original = dry = In 1 and the effect return signal = wet = In 2) have nearly the same loudness. The amplification range of the FX return amplifier is 1 to 50 (or 0 to 33dB). The output of the amplifier is normalled to the upper socket of Input 2. In this application no plug is inserted into the upper In 2 socket. The lower In 2 socket can be used to obtain the effect return signal before it is processed by the crossfade unit of the A-138d. The CF control of the A-138d works now as a dry/wet control for the external effect. In the leftmost position of CF only the original signal (i.e. not processed) appears at the Mix Output, in the rightmost position only the effect signal. In the center position the original and the processed signal appear with the same level at the Mix Output. The mute switch can be used to mute the original or the effect signal independent of the position of the crossfade control. In the center position it has no function.
Attention: If the small sockets In 2 are used (i.e. no FX return via the 1/2" socket) the signal has to be fed into the upper socket In 2. Then the lower socket In 2 can be used to forward the signal to another module! The upper socket In 2 is normalled to the output signal of the internal amplifier that amplifies the FX return signal. If a plug is inserted into the upper In 2 socket this internal signal is interrupted (switching contact). That's valid even if no FX return signal is connected as in this case the output of the amplifier is ~ 0V/GND. If a plug is inserted into the lower In 2 socket only a short circuit between this signal and the output of the internal amplifier is made ! Nothing can be damaged within the A-100 but the results will be strange. Please refer to the sketch below for internal wiring details.
Typical applications:
- Crossfader for two different A-100 signals
- Crossfade between original and processed audio signal (dry/wet control). For this the incoming audio signal is patched to input 1 of the A-138d and passed on to the audio input of the sound processing module in question (e.g. filter, phaser, flanger, frequency shifter, wave multiplier, wave shaper ...). The audio output of the sound processing module is patched to input 2 of the A-138d.
- Involving external effect units into A-100
- dry/wet control for the external effect
Technical notes:
- The crossfader section of the module is DC coupled, i.e. it can be used also for the crossfading of CV signals (like LFOs, ADSRs)
- The amplifier in the FX return path is AC coupled and cannot be used for CV signals.
Width: 8 HP / 40.3 mm Depth: 40 mm (measured from the rear side of the front panel) Current: +20mA (+12V) / -20mA (-12V)
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
Product Overview
Module A-138d can be used in two different ways:
- as a crossfader module within the A-100
- as an insert module for external effect units (e.g. guitar stomp boxes) with dry/wet control
If the module is used as a crossfader within the A-100 the two audio signals are connected to the sockets In 1 and In 2. The position of the CF (Crossfade) control defines the relation between the levels of the signals In 1 and In 2 that appear at the Mix Output. In the leftmost position of CF only In 1 appears at the output, in the rightmost position only In 2. In the center position both inputs appear with the same level at the Mix Output. Each input is equipped with two sockets (miniature multiples) so that the input signals can be forwarded to other modules too. Even the Mix Output has two sockets available. The mute switch can be used to mute In 1 or In 2 independent of the position of the crossfade control. In the center position it has no function. The controls Atten. and Amp. and the 1/4" sockets FX Send and FX Return are not used in this application.
If the module is used as an effect send/return module with dry/wet control the A-100 signal that has to be processed by the external effect unit is connected to In 1. The signal can be attenuated by control Atten. before it is output to the 1/4" socket FX Send. The attenuator has been added because some effect units without input level control (especially guitar stomp boxes) will distort with A-100 levels (~ 1 Vss or more). The attenuator can be used to reduce the signal level so that no distortion occurs. Atten. is adjusted so that the external effect unit does not distort. The output of the external effect unit is connected to the 1/4" socket FX Return. This socket is followed by an amplifier and the control Amp. is used to amplify the signal to obtain again A-100 audio level (~ 1Vss or more). Amp is adjusted so that the loudness of both signals (i.e. original = dry = In 1 and the effect return signal = wet = In 2) have nearly the same loudness. The amplification range of the FX return amplifier is 1 to 50 (or 0 to 33dB). The output of the amplifier is normalled to the upper socket of Input 2. In this application no plug is inserted into the upper In 2 socket. The lower In 2 socket can be used to obtain the effect return signal before it is processed by the crossfade unit of the A-138d. The CF control of the A-138d works now as a dry/wet control for the external effect. In the leftmost position of CF only the original signal (i.e. not processed) appears at the Mix Output, in the rightmost position only the effect signal. In the center position the original and the processed signal appear with the same level at the Mix Output. The mute switch can be used to mute the original or the effect signal independent of the position of the crossfade control. In the center position it has no function.
Attention: If the small sockets In 2 are used (i.e. no FX return via the 1/2" socket) the signal has to be fed into the upper socket In 2. Then the lower socket In 2 can be used to forward the signal to another module! The upper socket In 2 is normalled to the output signal of the internal amplifier that amplifies the FX return signal. If a plug is inserted into the upper In 2 socket this internal signal is interrupted (switching contact). That's valid even if no FX return signal is connected as in this case the output of the amplifier is ~ 0V/GND. If a plug is inserted into the lower In 2 socket only a short circuit between this signal and the output of the internal amplifier is made ! Nothing can be damaged within the A-100 but the results will be strange. Please refer to the sketch below for internal wiring details.
Typical applications:
- Crossfader for two different A-100 signals
- Crossfade between original and processed audio signal (dry/wet control). For this the incoming audio signal is patched to input 1 of the A-138d and passed on to the audio input of the sound processing module in question (e.g. filter, phaser, flanger, frequency shifter, wave multiplier, wave shaper ...). The audio output of the sound processing module is patched to input 2 of the A-138d.
- Involving external effect units into A-100
- dry/wet control for the external effect
Technical notes:
- The crossfader section of the module is DC coupled, i.e. it can be used also for the crossfading of CV signals (like LFOs, ADSRs)
- The amplifier in the FX return path is AC coupled and cannot be used for CV signals.
Technical Specs
Shipping Details
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
