Roland DDR-30

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The Roland DDR-30 “Alpha Drum” is a 6‑voice digital PCM drum module released in 1985. It was designed to pair with PD‑10 and PD‑20 pads as the Alpha Drum System, or be played from a MIDI controller. The unit is 2U tall, about 19 inches wide, and 3.5 inches deep, with a large VFD display that shows patch data and parameter details.

What it does
- Voices: 6 total — bass, snare, and four toms. Each voice uses four 12‑bit PCM samples and can be shaped with 16 parameters, including Attack, Decay, Pitch, EQ, Bend, and Gate.
- Patches and kits: 48 internal patches and 32 drum kits, with an optional M‑16C memory cartridge to add 64 more patches.
- Control and editing: A front‑panel Alpha Dial lets you tweak voice parameters, with Edit/Set, Bank, and patch selection buttons. Early prototypes had six per‑voice volume knobs that were removed in the final release.

I/O and outputs
- Triggers: Six XLR inputs for PD‑10/PD‑20 pads (or other compatible triggers).
- Audio outputs: Stereo main outputs (the right output can double as the mono output) plus six individual outputs (one for each voice) for separate processing.
- MIDI: MIDI In, Out, and Thru for use with keyboards, drum machines, or computers.
- Other: A memory cartridge slot and a bright signal/status indicator.

How it works
- Sound design: Each voice uses four PCM samples, and you can modify the patch with six parameter groups (Attack, Decay, Pitch, EQ, Bend, Gate). Patch data can be stored and recalled from internal memory or the optional M‑16C cartridge.
- Compatibility: The DDR‑30 is not compatible with the newer Roland trigger cables used by some modern pads, but it can be triggered by MIDI from many controllers. It uses fixed ROM PCM samples (not user‑swappable), and there are six conventional voice outputs plus the main stereo mix.

History and notes
- The DDR‑30 was one of Roland’s first electronic drum systems, introduced during the 1985 Summer NAMM show in New Orleans. Early prototypes featured six per‑voice volume pots, which were not included in the final product.