Patches and discussion for Ensoniq VFX family

> After successful loading, if the sequencer does not remain 
> loaded when you turn on and off the VFX-SD, this means that 
> the internal battery is dead.

The battery is certainly worth checking.  It should be something on the
order of 3.2 volts dc if I recall (measured, obviously, with the unit turned
off).  The nominal voltage is marked on the battery.  If it has never been
replaced, its ability to hold a charge is probably questionable given the
age of these things.

I replaced the battery in my SD-1 with the socketed version from Route 66
Studios.  The solder tabs on the socket don't fit in the old circuit board
holes, so I mounted the socket/battery to the case next to the board with
double sided tape and ran a couple of short leads to the circuit board.
Requires disconnecting several cables and removing the board from the case
to get to the solder traces on the bottom.  It isn't all that tricky, but
depends on whether or not you're comfortable doing that sort of thing ...

Grant