PSS-270 Video

Here is the video of the Yamaha PSS-270:

Presented on this keyboard are the best (from what I found) of the available --circuit bent--modifications.  The FM Data line modification interrupts the data between the FM chip (YM2413) and the XC194AO chip.  By cutting off and selecting different Voices, altered sounds, tones and drones can be generated.  It also works on the Rhythm section.  The LFO mod was the last bend found during my search of the circuit board.  By using various some caps I can alter the tone and range of tone with the control (potentiometer).  The LED's' light up once this data is transfered from one part of the corcuit back in to the XC194AO chip.  This mod is the Top left knob and switch (with RED and YELLOW LED's).

I'll post additional information on the FM modification later.  I get questions often regarding this; it works on many YAMAHA series and not that difficult.