Manufacturer's description
Terminal 4 by Klavis is a quad-channel essential module that consolidates four independent signal paths, each housing a VCA, a low-pass gate (LPG), and an envelope generator. This is complemented by a versatile mono/stereo mixer.
Each VCA is DC-coupled, handling both audio and CV with precision, offering flexible amplitude shaping and modulation. They feature linear/logarithmic curve adjustment, offset setting, and zero-crossing switching for clean level transitions.
Stereo linking with manual and CV control of balance allows for seamless handling of dual-mono or spatialized stereo content.
The LPG section adds a distinct analog character with four dedicated low-pass gates, each offering three curated presets of typical warmth and organic sound. These provides tonal flexibility and creative coloration without extra patching.
The 6dB/Oct single Vactrol preset provides a delicate yet effective all-purpose embellishment
The 12dB/Oct dual-Vactrol one offers "the" classic and colourful LPG everyone expects, bringing ear-candy to any sound.
Finally, we included an LPG/OTA-VCF chimera presenting a 24dB/Oct cutoff for punchy and resonant filtering beyond traditional LPGs.
What truly elevates Terminal 4 is its integrated envelope section. Each channel features its own envelope generator with eight distinct templates, adjustable through proportional timing and tailored by linear to logarithmic curvature.
These envelopes can control the internal VCA or LPG directly or be routed out as CV sources for use elsewhere.
Unconnected outputs are down-mixed, respecting a mono or stereo flow as needed. 2/1, 2/2, and 3/1 combinations are handled automatically. Mixing applies to audio but also to external modulation signals and/or the onboard generated envelopes.
Clipping LEDs on each channel offer instant visual feedback for level control. For smooth editing, the matching of each pot setting and position is reflected in the nearby white LED, while an animation tells in which direction to turn.
This layered architecture allows Terminal 4 to serve as both a dynamic processor and a modulation hub. Whether deployed as a quad VCA, LPG, envelope bank, mixer — or all four simultaneously — it offers a powerful, space-conscious solution for nuanced control over amplitude, tone, and timing within a single Eurorack module.
Features
- 4 independent channels or 2 stereo pairs VCAs, each with:
- Audio & CV handling
- DC-coupling
- Lin/Log curve setting
- Offset setting
- Zero-crossing switching (ZX)
- Stereo linking with balance setting + CV
- Mixing of unconnected outputs
- Individual level clipping LEDs
- 4 dedicated LPGs, each with:
- Three presets offering various topologies and renderings
- 4 dedicated Envelope Generators, each with:
- 8 envelope templates
- Proportional time setting
- Lin/Log curve setting
- VCA/LPG control or envelope CV generation
- 5 LEDs indicating potentiometer vs. value matching for user-friendly editing
- Settings restored after power cycle
- Easy firmware update via a simple audio file
- 2mm thick aluminium panel
- Skiff-friendly & compact module
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, 'next working day' shipping is free if the order value is over £150, and £5 otherwise. We can also ship on a 'next working day before 12pm' service, which costs £6 for orders over £150 and £7.50 for orders under £150.
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 DPD and Royal Mail for the UK, and for international orders it's either DPD, DHL, FedEx, UPS or Royal Mail 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 16:00. 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 the couriers may come to collect a little earlier than scheduled which would also push an order into the next day.
Saturday/Sunday delivery
If you're in the UK and you order before 16:00 on a Friday then we can send something for a Saturday or Sunday delivery with DPD. This is FREE for order values over £350, £5 for order values between £75 and £250, and £7 for order values under £75. (NB: this applies to UK mainland addresses only). Please note that any orders placed after 16:00 on a Friday will ship on the Monday.
International shipping times
Most orders are delivered within 3 to 5 working days if sent on a courier service. Royal Mail services can take a lot longer and are often less secure.
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
Manufacturer's description
Terminal 4 by Klavis is a quad-channel essential module that consolidates four independent signal paths, each housing a VCA, a low-pass gate (LPG), and an envelope generator. This is complemented by a versatile mono/stereo mixer.
Each VCA is DC-coupled, handling both audio and CV with precision, offering flexible amplitude shaping and modulation. They feature linear/logarithmic curve adjustment, offset setting, and zero-crossing switching for clean level transitions.
Stereo linking with manual and CV control of balance allows for seamless handling of dual-mono or spatialized stereo content.
The LPG section adds a distinct analog character with four dedicated low-pass gates, each offering three curated presets of typical warmth and organic sound. These provides tonal flexibility and creative coloration without extra patching.
The 6dB/Oct single Vactrol preset provides a delicate yet effective all-purpose embellishment
The 12dB/Oct dual-Vactrol one offers "the" classic and colourful LPG everyone expects, bringing ear-candy to any sound.
Finally, we included an LPG/OTA-VCF chimera presenting a 24dB/Oct cutoff for punchy and resonant filtering beyond traditional LPGs.
What truly elevates Terminal 4 is its integrated envelope section. Each channel features its own envelope generator with eight distinct templates, adjustable through proportional timing and tailored by linear to logarithmic curvature.
These envelopes can control the internal VCA or LPG directly or be routed out as CV sources for use elsewhere.
Unconnected outputs are down-mixed, respecting a mono or stereo flow as needed. 2/1, 2/2, and 3/1 combinations are handled automatically. Mixing applies to audio but also to external modulation signals and/or the onboard generated envelopes.
Clipping LEDs on each channel offer instant visual feedback for level control. For smooth editing, the matching of each pot setting and position is reflected in the nearby white LED, while an animation tells in which direction to turn.
This layered architecture allows Terminal 4 to serve as both a dynamic processor and a modulation hub. Whether deployed as a quad VCA, LPG, envelope bank, mixer — or all four simultaneously — it offers a powerful, space-conscious solution for nuanced control over amplitude, tone, and timing within a single Eurorack module.
Features
- 4 independent channels or 2 stereo pairs VCAs, each with:
- Audio & CV handling
- DC-coupling
- Lin/Log curve setting
- Offset setting
- Zero-crossing switching (ZX)
- Stereo linking with balance setting + CV
- Mixing of unconnected outputs
- Individual level clipping LEDs
- 4 dedicated LPGs, each with:
- Three presets offering various topologies and renderings
- 4 dedicated Envelope Generators, each with:
- 8 envelope templates
- Proportional time setting
- Lin/Log curve setting
- VCA/LPG control or envelope CV generation
- 5 LEDs indicating potentiometer vs. value matching for user-friendly editing
- Settings restored after power cycle
- Easy firmware update via a simple audio file
- 2mm thick aluminium panel
- Skiff-friendly & compact module
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, 'next working day' shipping is free if the order value is over £150, and £5 otherwise. We can also ship on a 'next working day before 12pm' service, which costs £6 for orders over £150 and £7.50 for orders under £150.
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 DPD and Royal Mail for the UK, and for international orders it's either DPD, DHL, FedEx, UPS or Royal Mail 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 16:00. 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 the couriers may come to collect a little earlier than scheduled which would also push an order into the next day.
Saturday/Sunday delivery
If you're in the UK and you order before 16:00 on a Friday then we can send something for a Saturday or Sunday delivery with DPD. This is FREE for order values over £350, £5 for order values between £75 and £250, and £7 for order values under £75. (NB: this applies to UK mainland addresses only). Please note that any orders placed after 16:00 on a Friday will ship on the Monday.
International shipping times
Most orders are delivered within 3 to 5 working days if sent on a courier service. Royal Mail services can take a lot longer and are often less secure.
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.
