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AJH Synth DH-ADSR Envelope Generator Eurorack Module (Silver)

AJH Synth

£195.00
In stock.
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Shipping info

The DH-ADSR is exactly the same circuit as the original Model D envelope and therefore features the same contour shape and retrigger behaviour, but with the addition of a release control. However, they have also added a pulse delay and pulse stretch circuit, along with a re-trigger facility (both of these can be switched out of circuit so that the envelope is a simple ADSR unit).

The addition of pulse stretching and retrigger makes it into an LFO module and it can perform in a similar way to the EMS Synthi A and VCS3 Trapezoid generator, with a variable delay between each trigger and a variable "on" time - however it can also have full ADSR envelope on each retrigger too!

Notable Features:

- PREDELAY - This control determines how long (up to 10 seconds) the start of the envelope is held off, after a gate is received. This ability to delay the onset of the envelope is especially useful when used in conjunction with a standard ADSR: With both envelopes receiving the gate simultaneously complex envelopes can be produced as the DH-ADSR only starts running through its stages after the standard ADSR has completed. Once their outputs are mixed together in a mixer a single evolving envelope with multiple stages is produced!

- Use of the bipolar mixer found in the MINIMOD CV MIX-OFFSET-VCA module can enhance this technique even further, with more precise control over the polarity/offset of the envelope mix possible. Using the VCA of this module could allow for external modulation over either/both of the signals. It goes on...

- HOLD - When in Del-Hold mode (switch down) the HOLD control determines the gate length applied to the envelope, and thus controlling its length/overall shape. When the switch is up, normal ADSR action is produced.

- RETRIG - In this mode the DH-ADSR becomes an LFO, which can mimic the "Trapezoid" function of the vintage EMS designs. HOLD controls the length of the trapezoid shape, and PREDELAY allows for adjustable gaps between each repeat of the shape produced.to an LFO module and it can perform in a similar way to the EMS Synthi A and VCS3 Trapezoid generator, with a variable delay between each trigger and a variable "on" time - however it can also have full ADSR envelope on each retrigger too!

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

The DH-ADSR is exactly the same circuit as the original Model D envelope and therefore features the same contour shape and retrigger behaviour, but with the addition of a release control. However, they have also added a pulse delay and pulse stretch circuit, along with a re-trigger facility (both of these can be switched out of circuit so that the envelope is a simple ADSR unit).

The addition of pulse stretching and retrigger makes it into an LFO module and it can perform in a similar way to the EMS Synthi A and VCS3 Trapezoid generator, with a variable delay between each trigger and a variable "on" time - however it can also have full ADSR envelope on each retrigger too!

Notable Features:

- PREDELAY - This control determines how long (up to 10 seconds) the start of the envelope is held off, after a gate is received. This ability to delay the onset of the envelope is especially useful when used in conjunction with a standard ADSR: With both envelopes receiving the gate simultaneously complex envelopes can be produced as the DH-ADSR only starts running through its stages after the standard ADSR has completed. Once their outputs are mixed together in a mixer a single evolving envelope with multiple stages is produced!

- Use of the bipolar mixer found in the MINIMOD CV MIX-OFFSET-VCA module can enhance this technique even further, with more precise control over the polarity/offset of the envelope mix possible. Using the VCA of this module could allow for external modulation over either/both of the signals. It goes on...

- HOLD - When in Del-Hold mode (switch down) the HOLD control determines the gate length applied to the envelope, and thus controlling its length/overall shape. When the switch is up, normal ADSR action is produced.

- RETRIG - In this mode the DH-ADSR becomes an LFO, which can mimic the "Trapezoid" function of the vintage EMS designs. HOLD controls the length of the trapezoid shape, and PREDELAY allows for adjustable gaps between each repeat of the shape produced.to an LFO module and it can perform in a similar way to the EMS Synthi A and VCS3 Trapezoid generator, with a variable delay between each trigger and a variable "on" time - however it can also have full ADSR envelope on each retrigger too!

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.