Rhodes Chroma Polaris

>>  When you do a 'load all', do you see any change
>> in behaviour of the LEDs?

>  No change in LED during load all.

99% of the time it is really just a 'level' issue.  If the 'upper function' 
button stays lit - but none of the program buttons flash, it usually means 
that there's a break in the signal, or the level is too low.  If you have 
any way to 'see' the level on the 1/4" jack going into the Polaris (e.g., 
oscilloscope, or even multi-meter), we can get a feel for the level.

In lieu of a good reference, my rule of thumb is usually to set the Polaris 
up to 'load all', and then continue to increase the levels until I see LEDs 
on the panel start to flash.  If they flash briefly once, and the the upper 
function LED goes out, then that may mean 'error', or too high of a signal 
level.

> Maybe I should try the DIN cable connection?  I have a 4
> way RCA DIN cable from an old reel to reel deck.  Would that work?

That connection would likely work; however, if you're already having 
difficulties in making sure the signal is OK, it might add another level of 
uncertainty unless you're certain which of the RCAs goes to the 'audio in' 
of the DIN connection.

Electrically, the 1/4" SYNC IN is intended to be the same connection as the 
audio-in from the DIN connector.

Good luck in your loading!