The GR-50 is a guitar to midi converter and tone generator featuring LA
style synthesis with 128 preset sounds, 63 rhythm sounds, and 64 user
programmable sounds which can be assigned to 2 independent parts and
controlled by the the guitar driver or external midi.

Features include

a newly developed GK2 guitar converter that is compact and has a
13 pin connector for the GR-50
2 timbres can be assigned to each string with dual / velocity switch
or velocity cross-fade modes
built in digital reverb
patch chain to store up to 25 patches in any sequence in any of 5
chains
and all the midi controller features of Roland's original GM-70.

The GK2 guitar converter can be mounted on electric or acoustic guitars. All
string sensitivity adjustments are done from the GR- 50, and the GK2 has
up/down buttons for patch selection or used to activate octave shift or hold
functions.

The GR-50 list is $1595.