=> R0 = new song speed (01-31) or tempo (32-255)
(speed (beats per note), fast 01-31 v. slow, default 06)
(tempo (beat frequency), slow 32-255 v. fast, default 125)
<= R0 preserved
This SWI provides user control over the speed of the currently playing song. This command has the same effect (and takes the same parameters) as the speed-change 'F' effect as used in ProTracker compatible songs. The only difference being that a value of 0 will NOT stop the song, use SWI QTM_Stop to do this.
After using this SWI, the song speed will remain at the new value until an 'F' effect is played, or the song is stopped. Note: if the 'F' effect is disabled, using QTM_EffectControl, the song will play at the new speed until it is stopped, or 'F' effects are enabled again.
The current speed and tempo can be read using QTM_ReadSpeed.
V flag set if no song loaded or the new speed/tempo is out of range.
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