Rhodes Chroma Polaris

my polaris still wont play softly on channel one - turn off touch sensitivity and its fine. Im trying to face the problem again.
--i have tried swapping all 5 socketed chips zx01 - zx05 and done the volume offset adjustment.No improvement. I am wondering what part of the main board takes the keyboard signal that seems on the schematic to have 'A' and 'B' contact paths (apparently correlating to the regular and touch sensitive signals) and selects how they go to the 6 voices. and where do these A and B signals enter the voice channel. The schematic shows a section called 'channel control" with 4 chips [incl z79-78 and z31-32]. would this be involved, or would the trouble lie only within the single voice (channel 1)?And where do these 2 signals combine to be one sound? any help to understand would be appreciated . Perhaps the problem is not in a socketed chip but even just a bad connection in the path of either the A or B signal, but would this discontinuity have to be in the voice channel area?.
thanks for any ideas.

> ... my polaris still wont play softly on channel one -
> turn off touch sensitivity and its fine...

To help let us know where we're at on this topic, can you confirm that
the per-channel offset calibration noted by Paul DeRocco was completed?

Also is the same behaviour seen regardless of the 'destination' of the
touch sensitivity. e.g., is a disparity seen in the reponse if the
destination is the 'Volume Envelope' or the 'Envelope?'

ok--cool- i have got the 'soft' signal back in channel one.

I had previously done the 'volume offset" as Paul had described , but because i couldnt monitor LEDs showing the current channel during the offset calibration, i wasnt sure if i actually adjusted all 6 channels. so After reading this last post from David, , i went back did it again, then as i had - no change, So I had an idea and DISABLED with 'Channel check" all but the bad channel (no.1) and THEN did the volume offset calibration only once , Gaurenteeing i was adjusting only channel no.1 (the bad channel) and NOW IT SEEMS TO BE OK. i get signal with a soft touch. Assuming this really has done it, I thank Both Paul and David for describing the 'Volume Offset Calibration" i would not have thought of it. To answer David's question, The problem was only in the 'Volume Envelope' touch , not the filter "envelope' touch. and I guess I needed to just focus on the diabled channel for that test. the manual says to do the test by just 'Playing 6 notes'and adjusting the slider. but didnt say how to monitor each seperate channel clearly by itself. I had to guess that the 'channel check' mode setting would carry into the 'volume offset' test mode. I may be a hack, but im not a total idiot. This is a big relief to solve this minor but major issue.