Up for sale today is a Roland GM-70 GR-MIDI Converter Rack Unit in very good condition.

More from Roland:
- The Roland GM-70 GR To MIDI Converter was introduced to the guitar market in 1987. The GM-70 was one of the most significant technological leap found in any of the seven generations of Roland Guitar Synthesizer products. This was the first product to really give the guitar player the power and ability to use MIDI as a tool of expression. Even now, the GM-70 is still a very usable machine years after its introduction.

- Lets look at why this unit is so innovative. The GM-70 was the first Roland guitar converter that did not have any sounds of its own. Instead, it is designed to function as a guitar to MIDI converter that can efficiently transmit MIDI data to other MIDI devices. The GM-70 can also be used to control the slew of rack mounted MIDI guitar effects processors that have saturated the market in the last five years. The GM-70 works with the GK-1 which was the first hex pickup that could be mounted directly on a standard guitar. It also works well with any G series guitar.

- The MIDI Out of the GM-70 is fast and accurate. There are 128 total patch configurations which are programmed to transmit a significant collection of MIDI messages. Each patch is broken down into four individual "Branches." A branch includes a significant collection of MIDI parameters. For openers, each branch can be assigned to any MIDI channel and it can be set in Poly mode: all six strings on one MIDI channel, or Mono mode: each string on its own separate MIDI channel. Mono mode tracks much better than Poly mode because each string has its own independent bend messages that are transmitted to the responding synthesizers. Each of the four branches can also have its bend range set + or - 36 half steps which allows maximum flexibility with a collection of responding synthesizers. Each of the four branches can also have a separate velocity curve set to it and it can transmit a MIDI volume message to the synthesizer that it is assigned to. Within the individual string edits per branch, each string can be turned on or off, have an individual transposition set to it and, individual program change messages can be sent out per string, per MIDI channel. Remember all of these edit parameters are available for each branch. There are four branches in every patch and there are 128 patches in the GM-70.

- The final innovative MIDI controller function that is featured in the GM-70 is the ability to transmit any MIDI continuous controller message from a huge collection of controller knobs, switches and foot pedals. No less than eleven different controllers can be assigned to any type of MIDI controller message including: pressure, bend, modulation, volume, pan, hold, sostenuto. octave up etc.. The GM-70 was also the first GR product that worked with the FC-100 Foot Control Pedal. The FC-100 uses its own type of cable connector that transmits program change messages from numbered foot pedals. It also transmits controller messages from a controller pedal and an optional expression volume pedal. The FC-100 is even phantom powered by the GM-70, so it does not need batteries or a power supply.

We'll match or beat the price of any of the big retailers!

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Downtown Sounds is a worker-owned cooperative in downtown Northampton, Massachusetts.