The Hafler effect was used by stereo manufacturers during the mid 1950s to produce a mid channel during crossover (panning) from one channel to another. The end result was a smooth, flowing transition between channels that still surpasses today's electronic panning effects. Essentially, the center speaker is connected between both positive lines of the left and right channels. Though I haven't tried this with the keyboard, now that the old timers on the forum have jogged the cobwebs of my mind, I'll have to hook that up when I get back from tonight's gig.

Thanks for the memories guys and gals,

Gary