LM386 design wierdness- what's up with the "bypass" pin?

[MikeH]

So I've been playing with some 386 designs, and last night I was messing with one and playing with some caps and such between the 'bypass' pin and the output a la the Parallel Universe to create some oscillations and stuff.  The I thought about throwing some diodes in the mix in there- sounded really cool; anti parallel diodes from bypass to the output created a really great, kind of cross over distortion sound.  Pretty cool. 

Now a lot of 386 designs I've seen have an electrolytic cap from the bypass pin to ground, so I threw one of those on there (started with a 33uf), and it really intensified the cross over effect.  When I bumped it up to 100uf it was a little more pronounced but some really wierd stuff started happening.

I'm running the power on my breadboard off of a GGG power supply that I built for my bench,  and when I would dig in and play, the LEDs on the power supply would dim.  Also I have a small computer fan set up to pull away solder fumes, and when I would play the fan would slow down noticably and almost stop.  What's going on here? 

Looking at the datasheet it looks like the bypass is actually just hooked to V+ via a 15k resistor.   Which would explain why crazy power issues would occur.  So I guess my question is, is this bad to do?  Obviously using a large cap making my power supply dim out is bad, but... otherwise- with a smallish cap is it ok?  And what's happening here?