PLAYCOM
 
   This program  gives a 48K  machine the  capability to
use the  PLAY command, as on  the +3. It will  work with
the built-in sound chip on the  +3 in 48K disk BASIC, or
with the (Protek) "Programmable Sound Generator and I/O"
board. It can probably be adapted to work with any sound
board which controls an AY-3-891x via OUT statements.
   The code loads  in at 60000 (CLEAR  RAMTOP below this
before  loading).  The  statement  RANDOMIZE  USR  60000
should appear at the start of any program using PLAYCOM,
and  must be  typed  in before  a  PLAY  command can  be
entered.
   The PLAY  command is  actually typed  in by  pressing
graphic U  (because it  has the  same code  as the  PLAY
token on the +3). Its syntax is  the same as the +3 PLAY
command, so
   ¤ "O5cdefg","O3CbCag"
will produce the expected effect.
 
Notes:
   Up to  five strings  are allowed;  these will  all be
output -  the first  three to  the sound  chip, and  the
others to  the BEEP  channel. Note  that when  both BEEP
channels are active, the notes may  not quite be in tune
for technical reasons.
   The midi is not (as yet) supported.
   All commands mentioned in the manual except for Y and
Z are allowed.
   #  and $  only  work when  used  singly,  and not  in
pairs.
   This  program  is  more tolerant  than  the  +3  PLAY
command, as for  instance it allows note  length numbers
to appear anywhere (not just before note names), and the
T command works in all  channels (however it always sets
the tempo for all channels at once.
   When used with a sound board on the 48K spectrum, the
notes may  be out  of tune. A  table within  the program
will need to be changed.