"Scratch" control should correlate to the deck speed at all times

[mixxxbot]

Reported by: Pegasus-RPG
Date: 2010-03-01T20:14:09Z
Status: Fix Released
Importance: Wishlist
Launchpad Issue: lp530281
Tags: pitch, scratch, scratching, vinyl

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It would be ideal if the scratch control would work the same regardless of whether the deck is playing or not. Specifically, can it be the "master control" for a deck such that setting play to 1 merely sets scratch to 1? (and lights the play button, etc.) Right now, we can't slow a playing track below the play speed without stopping it first while simultaneously setting scratch=1, which is a very messy hack. (That's how the SCS.3d's vinyl2 mode works.)

More info:
currently when play==1 and scratch==0, deck speed==pitch.
When play==0 and scratch==0, deck speed==0.
But when play==1 and scratch==-0.001, speed==-1.001, so there's no way to get deck speed to be -1<speed<1 without first stopping it.

[mixxxbot]

Commented by: asantoni
Date: 2010-03-01T20:34:54Z

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Yeah, this behaviour sounds like it'd be handy for vinyl control too...

On Mon, Mar 1, 2010 at 12:14 PM, Pegasus wrote:

Public bug reported:

It would be ideal if the scratch control would work the same regardless of whether the deck is playing or not. Specifically, can it be the "master control" for a deck such that setting play to 1 merely sets scratch to 1? (and lights the play button, etc.) Right now, we can't slow a playing track below the play speed without stopping it first while simultaneously setting scratch=1, which is a very messy hack. (That's how the SCS.3d's vinyl2 mode works.)
(More info: currently when play==1 and scratch==0, deck speed==pitch. When play==0 and scratch==0, deck speed==0. But when play==1 and scratch==-0.001, speed==-1.001, so there's no way to get deck speed to be -1<speed<1 without first stopping it.)

** Affects: mixxx
    Importance: Wishlist
        Status: New

** Tags: pitch scratch scratching vinyl

** Description changed:

• It would be ideal if the scratch control would work the same regardless of if the deck is playing or not. Specifically, can it be the "master control" for a deck such that setting play to 1 merely sets scratch to 1? (and lights the play button, etc.) Right now, we can't slow a playing track below the play speed without stopping it first while simultaneously setting scratch=1, which is a very messy hack. (That's how the SCS.3d's vinyl2 mode works.)

• It would be ideal if the scratch control would work the same regardless of whether the deck is playing or not. Specifically, can it be the "master control" for a deck such that setting play to 1 merely sets scratch to 1? (and lights the play button, etc.) Right now, we can't slow a playing track below the play speed without stopping it first while simultaneously setting scratch=1, which is a very messy hack. (That's how the SCS.3d's vinyl2 mode works.)
   (More info: currently when play==1 and scratch==0, deck speed==pitch. When play==0 and scratch==0, deck speed==0. But when play==1 and scratch==-0.001, speed==-1.001, so there's no way to get deck speed to be -1<speed<1 without first stopping it.)

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"Scratch" control should correlate to the deck speed at all times
https://bugs.launchpad.net/bugs/530281
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[mixxxbot]

Commented by: Pegasus-RPG
Date: 2010-03-10T13:31:08Z

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Fix committed in fixes_scratch branch. Vinyl control needs to be adjusted to work with it though.

[mixxxbot]

Commented by: Pegasus-RPG
Date: 2010-04-07T06:29:59Z

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Let me explain the fix:

There is now a scratch_enable ControlObject that you set to 1 when you want the scratch CO to override the playback speed, which happens regardless of play status. Then you use the scratch CO to directly manipulate the deck speed. Setting scratch to 0 brings the deck to a stop, as it should. To disable scratching, set scratch_enable to 0. (In 1.7, setting scratch to 0 disabled scratching.) If scratch_enable is 0, changing scratch has no effect.

(So this doesn't work exactly like I proposed in the bug description, but it was more straightforward to code and solves the problem that precipitated this bug report.)

[mixxxbot]

Commented by: Pegasus-RPG
Date: 2010-05-13T14:45:12Z

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fixes_scratch has been merged to trunk. "scratch" still works as in 1.7, but "scratch2" and "scratch2_enable" implement this new behavior.

[mixxxbot]

Commented by: Pegasus-RPG
Date: 2016-10-01T14:28:35Z

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If this also affects another project, click "also affects project." Don't change the original project. (Why are you changing this old bug anyway?)

[mixxxbot]

Issue closed with status Fix Released.