Fixes  29th September 1995

PCSound 0.86
SharedSound 0.22

Bug with Replay use of 16 Bit linear handler causing PC
Sound to stop playback and therefore crash on attempt to
make sound on exiting windows.
Fixed by introducing a CheckDriver SWI to SharedSound which
is called by PCSound when any new sound playback is attempted.
If SharedSound has lost control of 16 bit output to, Replay
for example then this SWI forces it to regain control and
therefore for PCSound to be able to continue playback.

Fixes  2nd October 1995

PCSound 0.87

1. Help message in PC Sound changed from
   "Sound Blaster Emulation" to
   "PC Sound and MIDI Support"

2. Buffer content flag for 16 bit playback not being
   set by PCSound which would cause problems with
   long term use of SharedSound.
   Now sets it OK
