add 'no effect' to (quick) effect chain selector

[mixxxbot]

Reported by: ronso0
Date: 2022-07-05T15:22:04Z
Status: In Progress
Importance: Wishlist
Launchpad Issue: lp1980755
Tags: effects, gui, preferences

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It would be helpful to have an empty (quick effect) chain available by default.
Furthermore, I think a 'clear effect unit' action in the effect chain settings menu would be a welcome shortcut to clear a unit.

I want to disable all stuff in the audio chain I don't use, both because it's one more thing I'd need to check if something goes wrong (yes, that happens) and because I want to get rid of visual clutter (in the mixer).

Before the effects refactoring there was a '---' Quick Effect item in the EQ preferences which did exactly that. After the refactoring, the quick effect selector was restored in the prefs, though the 'empty' item is just a blank item, not recognized by / retrieved from the effects engine, and thus not valid or available in the quick effect selector.

My current workaround is store an empty chain, go to prefs, drag (copy) it to Quick Effect chains, then select it in the prefs (or mixer).

Would a fix be as easy as having a built-in empty chain?
(named '---' like other [empty] selectors)

[mixxxbot]

Commented by: daschuer
Date: 2022-07-05T15:48:47Z

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My guess is yes.

[mixxxbot]

Commented by: ronso0
Date: 2022-08-12T20:13:09Z

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Turns out a built-in empyt chain preset is not suitable because it can be edited which defeats the purpose. Instead I went the route to work with the '---' items in the comboboxes and adjust the effects manager to deal with that.

#4892
#10859