Re: [sc-users] How to use timingOffset from the Quant class ? Can i tweak it while running a Task ?

[James Harkins <jamshark70@xxxxxxxxx>]

On Sunday, December 29, 2013 5:07:45 AM HKT, henrique matias wrote:
> Hello Guys,
>
> On the Quant class: http://doc.sccode.org/Classes/Quant.html
>
> I can see that parameter "timingOffset", but i couldn't find which is the
> unit used. Is it milliseconds or is it relative to the clock's tempo?

Time values in SuperCollider are in seconds or in beats. I'm not aware of 
any scheduling class that uses milliseconds.

Anyway, indeed, you're right -- the Quant help file doesn't mention 
anywhere that timingOffset is in beats (relative to the clock's tempo). 
This makes sense, as it's used not only to offset the event's sounding 
time, but also for scheduling.

> Is there a way to tweak the timingOffset of a Task while its playing?

The timing offset is not a property of a Task, EventStreamPlayer or 
Routine. It does exactly two things, and two things only:

- Schedule a task to begin that many beats earlier than it would if the 
offset were 0.

- Delay events' sounding time by the same number of beats. (Note that the 
delay logic is part of the default Event prototype. If your Task is not 
using events, then the task will not automatically inherit that behavior.)

If you're using patterns and events, the pattern can override timingOffset. 
That will make the event sound at a different time.

If you want to change the timing offset without changing the sounding time, 
the only way is to un-schedule the old player and reschedule with the new 
timing offset. Something like this should do it, though I don't have time 
to test right now.

// 0.1 beat offset
p = Pbind(... something...).play(quant: [-1, 0, 0.1]);

// reschedule
(
var stream = p.stream, nextBeat = p.nextBeat;

p.stop;
p = EventStreamPlayer(stream, p.event).play(quant: [nextBeat, 0, 
newOffset]);
)

hjh

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