images courtesy of Kevin Lightner

"The Delta Music Research PCM synthesizer features 14 voices interfaced to a computer in banks of seven. Each of the 14 voices includes a digital waveform generator with memory holding standard synthesizer and complex sampled waveforms, a 4-stage filter, an ADSR, and a VCA, and switch-selected control circuitry. Modulation of all parameters is accomplished through the use of software generators, software-controlled hardware generators, and/or user input devices. Programmable 2-stage parametric EQ and a programmable dual delay line are also included. The system is currently set up to be controlled from a Commodore 64 computer with a software package that allows for 7-track sequencing of up to 38,000 events. The computer is also used to store sound parameters. Up to 1,000 patches can be stored per disk. With the extended sequencer running, memory is allocated to store 200 patches. The unit also features a 61-note keyboard with a spring-loaded joystick for real-time modulation effects. The system [was] available on a custom-order basis.

"Delta also offer[ed] a number of synthesizer modules, including a dual attenuator/multiple, a VCO, a parametric EQ, a VCF, a resonant VCF, a dual VCA, an ADSR, a stereo mixer, a dual 4-to-1 mixer, a balanced modulator/inverter/summer, a voltage-controlled analog delay, a reverb/preamplifier, a reverb/power amplifier and a dual LFO/noise source."----[text and photo from a Delta Music Research ad courtesy of Benjamin Ward]