A MIDI-controller for playing VSTs of
the legendary CS-80 synthesizer.

For many musicians, owning a Yamaha CS-80 synthesizer is a dream that’s out of reach - both financially (€60.000+) and in terms of required maintenance. While today’s VST replicas sound remarkably close, the true spirit of the CS-80 only comes alive when you have all controls at your fingertips. That’s why GLT Audio created the “Poor Man’s CS-80” — the PM-80, featuring 75 dedicated faders and a ribbon controller, offering an inspiring hands-on experience.

75 silk-smooth faders

30 cm ribbon controller

6 high quality waveform toggle switches

Slim table-top
metal enclosure

Well connected

Power and MIDI-out over USB-C

MIDI-out over 3.5mm jack

Expression pedal input (converts to MIDI)

CV and Gate out, assigned to the ribbon controller

Magnetic overlays to play other virtual instruments

Product details

Download a PDF with high resolution images to inspect functions and parameters

Use cases
  • Map the PM-80 to your favorite CS-80 VST, such as Cherry Audio's GX-80, Softube's Model 77, Arturia's CS-80 V, Xils Lab's The Eighty, Morphoice's Unstable or Memorymoon ME80.
  • Use the PM-80 for other VSTs, by adapting its parameters using magnetic labels.
  • Control a virtual audio mixer. (eg. 24 x level, 24 x pan, 27 faders for effects)
  • Control hardware directly in a DAWless setup, using the MIDI DIN output (even allowing SysEx on customized firmware).
  • Connect to your Eurorack: the ribbon controller outputs to CV and Gate.
  • As a powerful generic MIDI controller, the PM-80 can even be used for applications like DMX light control and VJing.
Product details
  • 75 high quality silk-smooth 30mm faders by Alps Alpine (all without detents).
  • 30 cm ribbon controller.
  • 6 high quality waveform toggle switches and 3 slide switches.
  • 1 special switch: while pressed you control 75 additional CCs.
  • Slim table-top metal enclosure with screen printed metal faceplate and rubber feet.
  • We will share the source code, allowing firmware customization by the user.
  • Dimensions of the enclosure: 410mm x 205mm x 20mm.
  • Designed and assembled in the The Netherlands.








Connections
  • Power and MIDI over USB-C
  • 3.5mm TRS MIDI-out (Type A)
  • 3.5mm TRS CV & gate out (assigned to the ribbon controller)
  • 3.5mm TRS expression pedal input (value sent out over MIDI)
Additional items
  • Magnetic overlay labels for:
    • a famous 1977 poly synth
    • a famous ladder filter mono synth
    • blank (for handwriting)
    • more to follow…
  • 3.5mm TRS to MIDI DIN converter.
  • 3.5mm to 6.3mm TRS converter for expression pedal input.

You may wonder…

Why did you develop a MIDI-controller for CS-80 VSTs?
The CS-80 reminds a bit of the fall of Rome: it's fascinating how a place with such advanced sophisticated technology fell down, and how it subsequently took ages to re-invent all their ingenuity. Similarly it seems odd that the 50 year old elegant expressive architecture of the CS-80 (1976) has still hardly been surpassed by modern instruments.

The CS-80 is a beautiful breathing performance instrument: the voice architecture, clever musical assignments and knob-per-function interface are brilliant, and not to forget it sounds beautiful as well.

Its large amount of controls may intimidate, but after diving in you will realize it can be as immediate as programming a Juno: performing while shaping the sound. And in the age of poly aftertouch, it's very rewarding to have 7 faders dedicated to aftertouch assignment.

Just minutes after playing a CS-80 VST for the first time, we realized this remarkable synth architecture deserved its own dedicated MIDI controller. When using the PM-80, you can switch off your computer screen and completely immerse yourself in the instrument for hours.

Is the PM-80 identical to the CS-80 interface?
No, we intentionally skipped certain functions and added others. When designing the PM-80, we carefully studied the original CS-80, modern replicas, and VST interpretations. Here’s the reasoning behind our design choices:

FADERS

  • The faders feature a 30 mm travel, just like the original CS-80.

  • The lower row uses faders rather than the iconic inverted-polarity organ-style levers. Those vintage-style levers are nearly impossible to source, would increase cost and size, and would make the PM-80 less suitable as a general-purpose MIDI controller.

  • No detents: While some controls might benefit from center or stepped detents (e.g. sub-osc waveform, octave feet selectors), adding mechanical detents would significantly raise production costs and reduce the PM-80’s flexibility as a universal controller.

  • We picked fewer colors for the vinyl fadercaps (leaving out black and white and replacing these with grey), but mostly stay close to the functional color coding of the CS-80.

OMITTED FEATURES

  • We choose not to include the full keyboard control section in the current design (left of the CS-80’s keyboard - portamento speed etc) in order to stick to a compact 75-slider arrangement. But based on recent feedback, we'll be making adjustments in the coming design phase to be able to include the Sustain and Portamento fader.

ADDED FEATURES

  • The waveform section includes a triangle oscillator toggle. The original CS-80 didn’t offer this, but several VSTs do. Adding it also makes the layout more consistent with subtractive synth architectures of other VSTs that you may want to map to the PM-80.

  • We added a filter envelope invert switch inspired by Cherry Audio’s GX-80.

  • We added a sustain (latch) toggle. We discovered that the CS-80 architecture makes an amazing ambient drone machine when you explore sounds while adjusting the 75 fader with both hands. Playing the ribbon control while sustaining a chord is an interesting application as well. You can set it up to apply traditional sustain or sostenuto.

  • We added two effects faders labeled Reverb and Delay, though users can remap them to effects such as Tremolo or Chorus.

  • We added a pan spread fader, which allows users to increase the stereo spread between Layer 1 and Layer 2. This pan fader wasn't a feature on the CS-80 but is a feature of most CS-80 VSTs and creates beautiful stereo width.

  • We added one switch (top-right corner) which can be used to send one additional CC (momentary switch or toggle, visual feedback on the adjacent LED) or send out alternative CCs for all controls while holding down the switch.

FACEPLATE

  • The CS-80’s filters use an unusual envelope with Initial Level and Attack Level but no Sustain. We added a small diagram to the faceplate for clarity. (On the original, the IL and AL fader have opposite polarity — we prefer mapping them with matching orientation to make the envelope setup feel more intuitive.)

  • Minimal labeling: We intentionally omitted labels like “long–short” so users can choose their own control orientations when mapping the controls, and to keep a clean multi-functional interface.

RIBBON CONTROLLER

  • The original CS-80 ribbon is 49 cm long; the PM-80 features a 30 cm ribbon.

  • Ribbon material: The CS-80 used a textile/felt surface. We’re currently evaluating materials and are leaning toward a plastic surface in line with most modern ribbon controllers as textile is difficult to keep clean.

  • MIDI implementation: the unit will output the ribbon value as MIDI pitchbend in 14 bit. We are aware that the CS-80 has an expressive implementation where your finger-down position is seen as zero, and you can move up one octave or move down multiple octaves. We are planning to implement this behavior.

Why is the Poor Man's CS-80 still so expensive?
True, the PM-80 isn’t your budget MIDI controller — you could buy an analog synth for that money. But we think the PM-80 is worth its price:
  • Multiply the price of a well known plastic 8-fader MIDI-controller by 10 and plug them into a monstrous USB-hub. The result is: 80 faders plus loads of plastic, while spending a similar amount. We think the PM-80 is a more elegant solution.

  • The ribbon controller is an expensive part but adds incredible extra value. Some stand-alone ribbon controllers may cost you 50% of a PM-80 already.

  • The faders themselves are expensive parts. When you multiply that cost by 75, the total adds up quickly. This is likely why no other table-top MIDI controller offers this many faders.

  • Long-term value: The PM-80 is a long-term investment. It works as a universal controller for a wide range of VSTs, so you can use it across countless setups for years to come.

  • The PM-80 is built as a professional, high-end product using premium components and high-quality production techniques.

  • Crafted in small batches: This is a niche, speciality device — not a mass-produced product. Without large-scale production, the unit cost naturally remains higher.

  • No plastic; the durable metal enclosure and its screenprinted faceplate is beautifully produced by a company that manufactures for many premium audio- and synthesizer brands.
  • Ever looked at the price tag of a CS-80 plus a freelance specialized maintenance technician? That's what we call costly. ;)

What’s so great about the magnetic labels?
  • They turn the PM-80 into a true long-term investment. With magnetic labels, you can easily adapt the controller to different VSTs for years to come. Many VSTs use only half of the available faders so you’ll rarely run out of controls.
  • Smart visual design: your VST's toggle switch functions are indicated in a white rectangle. Allowing you to use faders as toggles.

  • Built-in storage: you can store multiple sets of magnetic overlays directly on the bottom of the PM-80. The rubber feet are taller than the magnets, leaving plenty of room to keep everything neatly in place and always within reach. This way you won't lose them in a dusty drawer - like so many gear accessoires.

How do I control my software with the PM-80?
Not many VSTs allow loading a downloaded CC template, so you will have to manually link the physical faders to their virtual counterpart. This is a quick process though, highly optimalised by all DAW/VST developers. The PM-80 provides 1-way-communication: it only sends out MIDI over USB and DIN - it does not receive MIDI by default. (But you could customize the firmware to receive MIDI over USB if you need that functionality.)
Why should I be excited about the Open Source firmware?
By sharing the code, we give the community the freedom to shape the PM-80 to their needs. You can easily customize the fader’s CC assignments – but there's more. Want to send SysEx over MIDI to control vintage synths like the DW-8000 directly from the MIDI OUT? Go for it. Or go one step further; turn it into a 75-step stand-alone MIDI sequencer, or a DMX lighting desk. Open Source lets you push the PM-80 far beyond its default capabilities.
Why did you include expression pedal input?
The CS-80 is known as an exceptionally expressive performance synthesizer, offering expressive input from key velocity, poly aftertouch, a ribbon controller, and a foot controller. Not many MIDI interfaces offer the feature of sending expression pedal value to MIDI CC, and we think the PM-80 completes the CS-80 inspired package by including this feature. You can connect a pedal such as the Roland EV-5.

Pre-order

  • Expected price: €499 (excluding shipping, taxes (21% in the EU), tariffs/duties)
  • We are currently engineering and expect to ship the first batch by July 2026.

  • Join the wait-list to secure your PM-80 and receive updates on the build progress.

  • Production and shipping batches are based on your wait-list position. The first names on the wait-list can place an order around March.

  • Mechanical, electrical or other details are subject to change.

Developed by GLT Audio

GLT Audio makes its debut with the PM-80. We are a design collective based in Den Haag (The Netherlands). The PM-80 is the product we wished existed, so we decided to bring it to life and offer it to the community.
Gijs Leijdekkers

Designer, musician, media-artist. Participated in product design projects for Nokia and Philips, and worked as experience designer on projects for BBC Earth, Live Nation and many international museums.

www.gijsleijdekkers.nl
SoundCloud
Gregor van Egdom

Creative-technical problem solver. Uses technology in a creative way, to solve all kinds of problems. Works as freelance industrial designer and all-round technologist on projects for Sony Ericsson, Secrid, Ben & Jerry's and Philips.

www.gregorvanegdom.nl
Federico Solazzo

Composer for film and television, and has extensive experience as keyboardist on a large range of synthesizers, including the Yamaha CS-80. Worked as a synth programmer and consultant for Nord Keyboards and Nonlinear Labs (C15). Having a seasoned music professional of his caliber on board as a consultant allows GLT Audio to further refine the PM-80 to meet the demands of professional users.


www.federicosolazzo.com

Contact

📸  Instagram

✉️ info@gltaudio.com
Newsletter: you can join the waitlist above to stay updated, even if you don't expect placing an order.

Press

You are welcome request a press-kit with high resolution images by email.
GLT Audio is not affiliated to Yamaha, Cherry Audio, Softube, Arturia, Xils Labs or Morphoice - this product is not a collaboration. Their trademarks belong to them.

© GLT Audio 2026