So today, after having gigged a number of times with my SK5 post-Phat Philter mod, and found the need for more gain needed, i opened it up to adjust the gain on the post-Phat Philter channels
1st up i tried swapping the 470K resistors that are set the input volume for something lower. I only had a pack of 100K, so I tried that, and while it was much lower, it was considerably more distorted.
so i went back to 470Ks and then put a transistor preamp i had built years ago at the output. much better. now the gain on the four voice channels is greater than the drum loops (but with a potentiometer, to pull it back it in)
much better.