The particularity of Roger Linn’s LM-1 Drum Computer is the use of a special circuit and AM6070 DAC, which makes the sample of the machine complicated for true-sounding results. Aly James decided to model the clocks and counters that read the EPROM memory, which feeds the DAC to decode its data in real time. The CEM 3320 filters were also modeled and you can replace the 8 voices (7+1) with EPROM data, just like on real machines. The hi-hat circuit with its VCA were also reproduced to create multiple sound variations.
Modeling also allows you to manage a nice number of controls, including CV pulses, voice tuning, velocity, outputs to the host and more.
The VLINN LM-1 Drum is available as a donationware, with a minimum of 15€. Aly James adds that a Mac version is also scheduled. You’ll find detailed info, including a 35-page manual and audio demos at alyjameslab.com.
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