Alesis ALESIS M20 owner manual Varispeed, 10-1

CHAPTER 10

VARISPEED

Varispeed changes the sampling rate to change the audio’s pitch. This feature only applies when the Clock Source is set to INT (Internal). Pitch mode is automatically set to Fixed whenever the M20 is being controlled by an external unit (for example, when SMPTE Chase is on).

The varispeed range is -300 through +100 cents (-15.91% to +5.95%) at a base 48 kHz sample rate and -200 through +200 cents (-10.91% to +12.25%) at a base 44.1 kHz sample rate. This allows a total sample rate range from approximately 39.289 kHz (-200 cents @ 44.1 kHz) to 50.854 kHz (+100 @ 48 kHz). Note that pitch changes affect all slave machines. Varispeed settings are retained in memory.

Operation	You press…	You see…
Enter Varispeed Edit	Varispeed button	Display shows amount of
mode		varispeed change in cents
		and as a percentage
Set varispeed amount	Enter amount with	Display shows amount of
	numeric keypad or	varispeed change
	Up/Down buttons.
	When Vari is set to 000,
	Up/Down buttons select
	+ or - before entering a
	number. If Vari is any
	other value, Up/Down
	increments/decrements
	the value.
Enable varispeed	Press Pitch Mode button	Vari in the pitch block
	until…
Disable varispeed	Press Pitch Mode button	Fixed in the pitch block
	until…

In Varispeed mode, the time counters will not show the true elapsed (i.e., “clock on the wall”) time intervals.

Synchronization warning: Any time code being sent from the M20 will be sped up or slowed down when using Varispeed mode. This may cause synchronization problems in other equipment that is slaved to the M20. If you’re using SMPTE time code synchronization anywhere in your project, use varispeed with great caution.

ALESIS M20 REFERENCE MANUAL 1.06 10-1