I'm a play by ear bassist that would like to add some background synth sound and play bass lines with the same instrument. I looked at a Yamaha SO8 in Pittsburgh early last summer and a Roland RS 9. Also I'm curious about a Yamaha PSRGX76. My search has been focused on 76 or 88 note boards. I'm a beginner in all respects but would like a good quality instrument. What's your opinion? Thanks for your help.