The Legendary Drum Sound

Linn LM-1

A legend never dies!

The VProm was originally based on THE killer drum machine in town back in the early 80s, this expensive drum computer was also the first to include real drum samples back in the days!

Early sample based drum machines used samples of acoustic drum sounds recorded on the fly through some basic hardware. The way they were recorded without any kind of anti-aliasing makes them cut better in a mix than anything available at the time, they sounded so great that they became an alternative to the analog drum sounds of that era. To this day, the unique sound of this vintage machine is highly regarded because only using samples of the analog output is not enough to reproduce the wide range of sound and character of this beast. One DAC(converter)and clock per voice and yummy filters! Yes it is a historical piece of gear that take a huge place in the 80s sound picture. Only around 500 of these things are out there so don't count on finding a working one easily and forget for cheap. It has been used by major acts like Prince, Phil Collins, Thompson Twins, Stevie Wonder, Gary Numan, Depeche Mode, The Human League, Jean-Michel Jarre, Vangelis, John Carpenter, Todd Rundgren,The Art of Noise... The Machine was made by a musician for musicians and I tried to stick to that standard :) So as there were no accurate VST for that legend out there... I had to make the VProm!


VPROM accurately reproduces the internal circuitry and filtering of the first legendary Drum Machine but is also perfectly able to read and import original, custom or vintage EPROMs from other Drum Machines of that era, legendary 80s machines such as the Linndrum, DMX, DrumTraks etc.(.bin files that you can find on the net) An EPROM is an integrated circuit that was used to store short audio sample data in a compressed format. VPROM is the closest thing to the real deal - reading and decoding original EPROM data images in real time using the exact decode table from the AM6070 DAC at a variable sample rate. VPROM also allow experimenting with your own sample database. You can convert samples with external tools and load compatible ULaw companded images (see manual for more info).

I hope you enjoy making funky grooves with VPROM as much as I do!

Disclaimer: The original name of this VST, "VLinn", has been changed at the request of the Linn Electronics copyright holder, Roger Linn. It is now named "VPROM". Aly James Lab has no affiliation with Roger Linn and has not received any consent from Roger Linn. We do not claim to reproduce the sounds of Roger Linn s product but rather this product creates sounds inspired by Roger Linn s past products.

Drum Machine EPROM

Get VProm 2.0!

VPromn VST

VProm VST Videos & Sounds Demos Playlists.


VProm Vintage Legendary Drums VST Features and Details


Following the exact datasheet decode table for 8bit companded incoming DATA. The real nasty gritty sound at every pitch, like the real thing, forget resampling or tuning crappy samples packs which will always sound dull at lower pitches! Option is now provided to keep the high frequency spectrum integrity at any tuning via efficient oversampling.


Hihat circuitry was pretty unique, the hihat proms were read constantly in a loop while only a VCA was triggered, for closed hihat the circuitry had the ability to discharge the current through an additional way based on the decay pot setting. This basically makes the hihat sounding different on every hit.

CEM 3320 Filters

Unlike the very first produced machines, some Voices with Bass frequency content were filtered to minimize the remaining 8bit noise, using a VCF configured as a lowpass filter with no resonance. The CV frequency of the VCF was shaped by the circuitry in a way that lets the transients pass through relatively unfiltered. The VProm lets you fine tune the CV pulse or completely bypass the filter, this is useful when a voice is tuned very low or if you want to replace a "Bass" slot with another EPROM that doesn't require filtering.


This wad one of the coolest features of early sample based drum machines, letting you tune any voice to a particular frequency for a wide range of sounds.

The PROMS data were read one byte at the time by a counter which speed was controlled by a relatively stable oscillator, the counters reading speed could then be affected by the external tuning pots in a limited range, + or - 1 Octave.

This tuning range can be tweaked and the VProm provides a useful wide range of pitch from 1000Hz to 44100Hz and anything in between based on a real mod. (See manual)

(Stock was 12048 - 30303Hz.)


The original machines featured separate outputs for every voices, so as the VPROM.

You can choose from ALL to 1 Stereo Channel or Separate Channels for each voice.


You can limit yourself to only 2 velocity levels or use the full range of MIDI velocity for convenience.


The GUI features the original trigger buttons for kick listening and controls over every aspect of the Drum Machine, most of the parameters like volume and pitch knobs can be MIDI learned and controlled by an external MIDI Hardware.


The VPROM provides the ability to replace some voices with external compatible 8bit companded EPROM data. This opens up the machine to LINNDRUM (LM-2), LINN 9000, DMX, DX, DRUMTRACKS etc... Samples or even load your own custom made. You can switch between custom loaded and stock EPROMS on the fly.

VPROM supports the following type and size EPROMS binaries (.bin)

2716(2048_Bytes) 2K

2732(4096_Bytes) 4K

2764(8192_Bytes) 8K

27128(16384_Bytes) 16K

27256(32768_Bytes) 32K

LOAD & SAVE FULL PATCH & BANKS in FXB/FXP (additional technical infos in manual.)

In addition from the new cross platform capability, VPROM version 2 features some improvement and changes compared to version 1

  • New MIDI Panel with MIDI learnable custom trigger maps
  • Change in default MIDI trigger map (see manual)
  • New panning capability per drum, panning knobs will replace the tuning knob row via a popup box selection (available while clicking on the TUNE label on the GUI. See control panels)
  • Improved GUI
  • All EPROMS can now be replaced versus only 7 of them in version 1
  • Easier and faster Custom EPROMs loading and management; no need to specify the size anymore, VPROM does it for you. Once loaded, custom EPROMs are saved with the patch
  • The additional CUSTOM voice is renamed to EXTRA and is now loaded by default with a modified delay-less stock Snare (see Manual -> EPROM Loading)
  • Double clicking a control resets to default value on most of the GUI controls
  • ALT+Left click on each Tune Knob in order to set the clock rate precisely by typing in a value. The main info display will now only display the last edited parameter info or value, such as which EPROM .bin is loaded or the knob, slider etc. current value
  • In addition to the original velocity mode, 2 Full velocity modes are now available with linear and now exponential response
  • Incoming MIDI Pitch-Bend Message is now recognized and will act as a Global tuning offset, great for live tweaking the whole set or to transpose up or down
  • VPROM now transmit its triggers as MIDI OUT
  • External MIDI learn for controls can now only be attached to MIDI CC messages (no more Sysx nor aftertouch)
  • New feature to change the mixer volume slider's response between Linear (original VST behavior) or Log Tappers (closer to hardware)
  • New feature to instantly stop the playing of the Extra voice, useful for choking cymbals.. It is working only with the EXTRA voice and the CHOKE event trigger is permanently fixed to note C4, when the note is triggered it will stop the EPROM playing immediately and be held in CHOKE until the EPROM is played again normally, the CHOKE is reflected on the EPROM playing status.
It was not necessary to model the original sequencer because regardless of all the urban legends about it, it is mainly a 48PPQN (pulse per quarter note) resolution thing. Modern DAWs features a finer resolution usually around 960PPQN or higher, this simply means that the same beat with some swing will not groove exactly the same at 960 or 48PPQN... An easy thing to do is to export your beat in MIDI a 48PPQN and import it back :) See the technical explanation below and VPROM manual

Linn LM-1 Groove and Swing explained

Linn LM-1 Groove and Swing explained


Windows 7 to 11 and higher, 32 or 64bit host, plugin provided formats are VST2 and VST3.

Mac OS:

Snow Leopard (10.6) to Monterey or higher, 32 or 64bit host, plugin provided formats are VST2, VST3 and AU (AudioUnits).


Avid Protools only supports its proprieratary format AAX at the moment but you can still easily load an AU or VST plugin with the help of a VST/AU host plugin, some popular solutions are DDMF Metaplugin or BlueCat's Patchworks, others might be available that I am not aware of yet.

Other info:

Working fine on Mac M1 (even if not native ARM yet). Working perfectly using Apple Rosetta 2 compatibility (only needed for VST format) AU format should load fine without doing anything else. Native ARM support is of course planned with VProm 3

Read the VProm Manual

Get amazing details about the first sample based drum machine and master the beast!


VProm User Manual


Powerful optional X16 oversampling keeping high frequency harmonics intact like on real hardware



New feature to change the mixer volume slider's response between Linear (original VST behavior) or Log Tappers (closer to hardware). Some people might have better habits with audio tapers so now you have the choice, keep in mind that default presets have been made using linear mode. The difference is Similar to this: linear will have finer detail over a small Db range of full volume, while Log can be easier for overall balance

Log Linear response


Hihat curve, timing and range updated, closer to hardware Some more advanced tests on hardware have been done to tailor the hihat VCA, timing and curve is now more accurate (new curve in RED)

Linn LM-1 Hihat

CHOKE action

New feature to instantly stop the playing of the Extra voice, useful for choking cymbals.. This is working only with the EXTRA voice and the CHOKE event trigger is permanently fixed to note C4, when the note is triggered it will stop the EPROM playing immediately and will be held in CHOKE until the EPROM is played again normally, the CHOKE is reflected on the EPROM playing status. You cannot assign note C4 anymore to custom MIDI mapping as it is reserved for CHOKE, if you still do, VPROM will warn you anyway :)


Voice names are now kept marked on top of the GUI panel when not in Mixer view: useful so you can actually use the tuning easily from every panel without using the tooltip naming of the tune knobs


Tune/Pan selection is now done in one click like a toggle switch

Change Log

Update History

You can check your current version inside the INFO panel on the GUI.
Updates for VPROM VST are free for bug fixes and donationware for added features until version 3.0

11/12/18 - v2.0.4
13/08/15 - v2.0.3 14/06/15 - v2.0.2

12/06/15 - v2.0.1


Get It !

Get VProm v2 for Windows & MAC

VProm 2.0 comes with both Windows & Mac Installers and Manual.
*works on Mac M1 even if not native ARM yet (see compatiblity info tab)