Rhodes Chroma Polaris

For those of you with decent soldering skills, it is pretty easy to 
add a filter input to the polaris.  Q9 on on the lower middle of the 
motherboard is a buffer for the noise source (Z64).  I lifted the 
Base of the transistor (marked B) and ran some thin shielded stereo 
cable to add an insert using the high output jack which is switched 
(and then routing the high output to the low jack).

Specifically you need to:
1) move wires from high output to low output (remove the resistors on 
the jack and store for future un-modding).  Leave the ground wire 
there.

2) carefully lift the B pin on Q9 (I did this by heating all 3 pins 
simultaneously and then tilting the transistor so the lead would pop 
out)

3) run shielded stereo cable.  one conductor from pad where Q9 base 
used to be (this is the noise send) to the shunt on the jack.  The 
other conductor from the Base pin on the transistor to the contact on 
the jack.  Ground the shield to the existing ground on the jack 
(orange wire).

The aux in will replace the noise source when a cable is plugged in 
to the high output jack-- so you need to turn on "noise" to enable it 
and can't be using ring mod.  I recommend setting volume release on 
max and then playing around w/sweep filter depth-- in sine mode the 
modulation is asynchronous so you can get some interesting beats 
going if you hit a few keys.  

The input is quite low.  It really needs to be boosted-- headphone 
out on one of my synths was fine, but another needed a bit of a boost 
first.

It would be trivial to use a hardwired switch or add a simple mixer 
for noise/input balancing.

-Ben