Sequencer Update

[List, Christopher]

> The 4515B is a 16channel multiplexor (line decoder) with built in
> latch.
> This is the perfect thing for that LED-showing-the-note thing I was
> talking about, and also for the semitone decoder. They are almost 30%
> cheaper than the 4067 - probably because they are not analog muxes, or
> maybe because of the smaller package.
> 
	Ug. Closer inspection reveals this chip to be Active Lo, rather
than Active High, so unless you're running it off of 0 to -15v supply,
it won't work too well :). 
	Oh well. I think I need a break...

	- CL