Modified and expanded Roland TR-707 Rhythm Composer for sale with exclusive Soundgas HKA mod.

Supplied freshly serviced and modified with extra voice EPROM expansion from HKA Design, but for this one they've added four banks (of the eight) with their sounds - an idiosyncratic selection culled from some of their favourite drum machines by their synth tech.

This non-invasive, reversible mod allows switching between eight banks of sounds (it still operates exactly as a stock 707 at power up). Featuring new drum sounds in each kit. The last two sounds  (707 crash + ride or 727 quijada + chime) remain the same across all banks, as they are stored on their own ROMs. The banks included are:

TR-707, TR-727, TR-808, TR-909, Soundgas Roland CR/TR (CR-78 & TR-66), Soundgas Korg favourites (KR-55 & Mini Pops 7), Soundgas Elka/Maestro (Drummer One meets Rhythm King), Soundgas Toy Box (Mattell + Casio)

All sounds are extracted from Soundgas machines. Note that the limitations of the EPROM storage mean samples must be short and punchy (hence the cymbals having their own EPROM). This affects the choice of sounds to include, and also means you won't get a deep booming 808 kick.

Bank switching is done by holding down one of the first 8 step keys while turning the machine on. The setting is remembered and will be recalled the next time it’s turned on.

POWER: These take a 12V Centre Negative power supply (not included but easy to source).

In excellent condition overall other than some slight screen burn on the LCD display but it still works fine. Only very minor scuffs to the sides and corners of the units. Please see photos or get in touch if you require more information on condition.