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Drumulator: Interfacing
Overview In the days before MIDI it was a challenge to interface different drum machines and sequencers. However it could be done, sometimes with a bit of electronics adapting.
Sequential Circuits The Poly Sequencer and the sequencer in the Prophet 10 could be driven by the Drumulator's clock out being hooked up to the sequencers clock in.
The Pro One's arpeggiator can be driven from the Drumulator by connecting the Drumulator trigger out to the Pro One's ext clock input.
The Prophet 600's arpeggiator can be driven by the Drumulator. Connect the metronome
output of the Drumulator to the Prophet's control switch jack. However you need Drum Mod 0.1 to widen the trigger pulse from the Drumulator from 1 to 10ms.
Roland
You will need a special adapter cable to hook into the Roland 5 pin DIN sync connectors. This needs to provide both clock and run/stop signals. Connect the clock out of the Drumulator to pin 3 of the Roland DIN connector. Connect a foot switch (normally open) to a "Y" cable. Connect one end of the "Y" to the run/stop jack on the back of the Drumulator, and the other end to pin 1 of the Roland DIN connector. Connect grounds to pin 2. This set up will work with the TR606, TR303, TR808 and MC4.
The Jupiter and Juno synthesizers can have their arpeggiators synchronised, by connecting the trigger output of the Drumulator to the external clock in of these synthesizers. But you do need Drumulator Drum Mod 0.1
Linn
The LM-1 runs at 48 pulses per quarter note., so it has to be the master clock. Connect the Internal Clock Out of the LM-1 to the External Clock Input on the Drumulator. Set the external clock divider on the Drumulator to 2. Set Auto Correct on the LM-1 to HI.
The Linn Drum is hooked up by attaching its Tape Sync Out to the Drumulator's External Clock Input, with the external clock divider at 2.
Oberheim
The DMX and DX use 96 pulses per quarter note, so they must be the master clock. Connect the Clock Out of the DMX or DX to the External Clock In on the Drumulator, and set the external clock divider to 4 on the Drumulator.
The DSX
sequencer has too narrow a clock pulse for the Drumulator to accurately sync to. A timing circuit has to be inserted - details of this are unknown.
Early Serial Number Fix
If you have a Drumulator before serial number 2500 and you are driving Roland kit, you will need to replace capacitor C74 with a jumper to help the sync.
Drum Mod 0.1
Some synchonisation has to be done with a wider trigger pulse from the Drumulator, this is Drum Mod 0.1. Remove C75 and replace with a jumper, then use a toggle switch to selectively add in a further 0.2uF of capacitance across C76. When the extra capacitor is switched in the pulse width increases ten fold to 10 ms
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