=> R0 = -1 to convert samples back to signed linear format
other don't convert samples
<= R0 is preserved
This SWI will switch off the QTM sound system and stop the current song playing, releasing any memory used for the song if it was loaded into RMA. The song cannot be restarted after this command, unless it is reloaded (from user-reserved memory, disc, etc.) using QTM_Load.
The CURRENT song can only be reloaded from user-reserved (not QTM's) memory
after calling QTM_Clear, if the samples have been converted back to
signed linear format (from the logarithmic format they were converted to
when the song was loaded). This can be done by setting R0 to -1 before
calling QTM_Clear. See QTM_Load for information on (re)loading a
song that is already stored in memory.
No error is reported if there is not a song loaded.
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