Modded SEQUENTIAL CIRCUITS DRUMTRAKS with 21 Extra Eproms

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

Pics of the inside below.

"SEQUENTIAL CIRCUITS DRUMTRAKS
Digital Drum Machine (1983)
one of a kind ! professional modified with several modswitches to get extra samples and sounds (switch and mute) !
used by German (Berlin) music project TOK TOK !

DRUM MACHINE Main panel features a segment display, 13 dynamic trigger pads, 9 buttons and numeric pad.
Back panel terminal connectors:
- main outputs
- 6 seperate outputs
- clock out
- metronome out (it generates +5V pulses)
- tape interface
- Midi interface

VOICES main core 8 bits NEC D780C-1 CPU part of Z80 ZILOG family manages 6 channels polyphony, each channel features 2 settings:
- individual volume gain
- pitch tune quantised into 15 different steps.

WAVETABLE 13 PCM waveforms at 8 bits resolution stored on socket EPROMS Erasable Programmable Read Only Memories.
TECH: TOM channels are filtered by famous chip Curtis CEM3320.
potChannel 1: Bass Drum potChannel 4: Crash cymbal / ride Cymbal
potChannel 2: Snare / Rim potChannel 5: Open / closed HH
potChannel 3: Tom 1 / Tom 2* potChannel 6: Claps / tambourine / cabasa /cowbell

SEQUENCER record in real-time mode or step mode.
Recording quantisation at variable resolution levels from 1/2 to 1/96 in 10 values: 1/2, 1/4, 1/6, 1/8, 1/12, 1/ 16, 1/24, 1/32, 1/48, 1/96 or swing shuffle.

SYNC internal frequency tempo range from 40 to 250 BPM, sync mode available in 2 ways:
- external Midi clock
- analog sync IN at 24 /48 /96 PPQ resolution, but Drumtraks outputs only at 24 / 48 PPQ resolution.

MIDI each sound is triggered with velocity levels and pads output MIDI with dynamic.

MEMORY:
- 3289 notes
- 99 patterns (100 measure)
- 99 songs
Data can be saved either tomidi exclusive dump or tape backup

included are 21 extra eproms - very hard to find ....."