Improved MICSAVE function

If you wanted to save the last 20 audio samples, you might use something like

MICSAVE (MICPOS+MICSIZE-20) MOD MICSIZE, 20, ARRAY

However, this will fail if, say, MICSIZE was 100 and MICPOS was 90. SB records audio into a circular buffer, but for some reason MICSAVE doesn't act like RINGCOPY You need to use MICSAVE twice when MICPOS is near the end of the buffer:

DEF MICSAVE2 START,LENGTH,ARRAY
 START=START MOD MICSIZE
 VAR REMAINING=MICSIZE-START
 IF REMAINING>=LENGTH THEN
  MICSAVE START,LENGTH,ARRAY
 ELSE
  MICSAVE START,REMAINING,ARRAY
  VAR EXTRA=LENGTH-REMAINING
  DIM TEMP[EXTRA]
  MICSAVE 0,EXTRA,TEMP
  COPY ARRAY,REMAINING, TEMP,EXTRA
 ENDIF
END