Hercules P32 mapping: more accurate headmix control

[pierrelegall]

The headmix is 4 times more accurate as it.

I feel it very handy :)

[pierrelegall]

Documentation PR: #3537

[Holzhaus]

@Be-ing don't you own a P32? Merge?

[Be-ing]

Yes, I have not yet tested this. I am doubtful it should be merged.

[pierrelegall]

From my point of view, the today head mix control is not accurate at all (9 possible positions vs. 33 in this PR, and moving from full cue to full mix is still available with one hand movement). I found it so much easier to match the headphone preview I need as it.

@Be-ing Can you please explain your doubts?

[Be-ing]

Originally I intentionally made this coarse because it's not important to have a smooth crossfade in your headphones that the audience doesn't hear. Generally, I'd think most users would only want this in one of three positions: fully left, center, or fully right. So I thought it was better to make it easy to switch between those states quickly.

After testing this again, I feel that the current coarseness is a bit awkward and unexpected. But I think 0.625 is too fine. How about 0.1?

[pierrelegall]

Originally I intentionally made this coarse because it's not important to have a smooth crossfade in your headphones that the audience doesn't hear. Generally, I'd think most users would only want this in one of three positions: fully left, center, or fully right. So I thought it was better to make it easy to switch between those states quickly.

Interesting ; I am new in DJing and I found this feature (firstly on a Numark Mixtrack II Pro, where a potentiometer is dedicate to) very important to beat match, pre-set EQs & co. well in every possible environments :o

After testing this again, I feel that the current coarseness is a bit awkward and unexpected. But I think 0.625 is too fine. How about 0.1?

*0.0625, not 0.625 ;)

I naively tried only 0.125 and 0.0625 because it's a multiple of the previous value (0.25).

I don't feel it awkward but I will give a try with 0.1 :)

[pierrelegall]

0.1 is better! :)

Change made.

[Holzhaus]

@Be-ing please don't merge stuff without also merging the corresponding manual PR: mixxxdj/manual#342

[Be-ing]

I didn't realize there was a manual PR for this because it was not linked here nor do I think this tiny change needed one.

[Holzhaus]

We should track changes using the versionchanged directive so that users aren't confused if controller behavior suddenly changes between releases.