Minimum framesPerPeriod() effect decay

[zonkmachine]

In response to #4284
Increase the 1 minimum frame to Engine::mixer()->framesPerPeriod();

[DomClark]

The time returned by timeout() is in units of buffers, so framesPerPeriod() probably isn't the thing to go for here. It seems there is already a one-buffer minimum, although with a buffer size of 256 at 44100Hz this is a mere 6ms, so a longer timeout would still be good. Rather than adding a constant to the value of the "Delay" knob, would it instead be worth increasing the minimum and/or default value of the knob instead?

[PhysSong]

The time returned by timeout() is in units of buffers, so framesPerPeriod() probably isn't the thing to go for here.

Correct. Simple calculation gives 1.486s for the buffer size of 256. I guess it's too long for minimum value.

although with a buffer size of 256 at 44100Hz this is a mere 6ms, so a longer timeout would still be good.

Agreed.

would it instead be worth increasing the minimum and/or default value of the knob instead?

That's more straightforward. I think it should be at least 50ms ~ 100ms(delay and/or dynamic processors may need longer time though).
Maybe it would be better to allow users to disable the automatic stop feature for effects. That will give a simple and straightforward solution for side effects like #4284.

[zonkmachine]

Maybe it would be better to allow users to disable the automatic stop feature for effects.

Already implemented. That's the setting named Keep effects running even without input.

[PhysSong]

Already implemented. That's the setting named Keep effects running even without input.

Thanks! I forgot about that. I don't know if it'd be better to allow changing that per effect.

[zonkmachine]

would it instead be worth increasing the minimum and/or default value of the knob instead?

That's more straightforward. I think it should be at least 50ms ~ 100ms(delay and/or dynamic processors may need longer time though).

I tried a minimum of 100ms but could still replicate the issue with some bpm settings. Maybe make 'Keep effects running even without input' default on?

[PhysSong]

Maybe make 'Keep effects running even without input' default on?

👍

[zonkmachine]

So, something like:

1. Close this PR
2. Disable the fx auto quit function for lmms-1.2 (as below)
   https://github.com/LMMS/lmms/blob/daa3f535158f321e7a01ea531fc3085f2d26ab37/src/gui/SetupDialog.cpp#L137:L138

	m_disableAutoQuit(ConfigManager::inst()->value( "ui",
						   "disableautoquit").toInt() ),

to

	m_disableAutoQuit(ConfigManager::inst()->value( "ui",
						   "disableautoquit", "1" ).toInt() ),

3. Keep Weird Behaviour of Delay Effects when Input is shorter than Delay Time #4284 open and add a better framesPerPeriod() fix at a later time?

[zonkmachine]

2. Disable the fx auto quit function for lmms-1.2

#4378