Apr 20, 2018 Reporting bugs and telling us your ideas on the Launchpad bug tracker is a big help too! We cannot fix problems we do not know about, so please let us know if you find any issues with Mixxx. If you would like to help translate Mixxx into another language, refer to the Internationalization wiki page. Of course, more programmers could always help. . The use of multiple MIDI devices simultaneously is not yet supported. SelectNextTrack, SelectPrevTrack and LoadSelected do not work in the Browse view. See bug #342120.

Hi there!

Using the deck selectors The deck selector is an essential feature of this Launchpad mapping. With it you can map multiple presets in multiple layouts on the main grid.

Nearly 15 years ago I used the Red Sound Infader and absolutely loved it, with it's 3 crossfaders for low/mid/high frequencies. Here is a link:
http://pro-music-news.com/html/08/e91207re.htm

In fact I miss it so much, that I decided to build a MIDI controller with the 'Tri-Fader' feature on my own. Obviously I would prefer to use it with Mixxx. But before I start buying the parts for the hardware device, I want to clarify how complicated it will be to implement such a feature software-wise?
I have very little programming experience, but am willing to try this task on my own. That is assuming nobody else, with better skills, is interested in doing this.

List of features to be implemented:

- 3 crossfaders (instead of just 1). One for low, one for mid and one for high frequencies.
- 1 button to switch between single and tri-crossfader mode.
- possibility for MIDI controller mapping

Could anyone please give me an estimation of the amount of work it might take?
Is it generally possible, or reasonable?
Which files or modules will I have to touch and where should I start?

In summary, it would be nice if someone could give me some kind of roadmap for this project!

Links For Using Launchpad

I've already downloaded the source code and setup the IDE. So this part is done and I'm ready to start.

Thanks in advance for your help!
Michael

The deck selector is an essential feature of this Launchpad mapping. With it you can map multiple presets in multiple layouts on the main grid. The main grid is the inner 8×8 grid on the Launchpad. You have to memorize the layout patterns, but don't worry, there are only 4 of them.

To select a single channel, simply press the button corresponding to the channel. This will remove all existing selections, and find the largest default preset that can be fit on the main grid.

Presets come in 3 different sizes: short (4×4), tall (4×8) and grande (8×8)<sup>1</sup>. Multiple presets can have the same size, but only one preset can be default per size.

To select multiple channels to be laid out, press the corresponding buttons in a chord. This way you can select to 4 channels.

So what is a chord? In a chord you press buttons so you only release the first after you pressed the last one. The order of presses matter, however the order of releases does not. Now, instead of writing down how the exact layout algorithm works, I just show you the four different layouts that is generated for 1 (single channel), 2, 3 and 4 note chords. Once more the algorithm will fill out the spaces with the largest default preset.

This means that e.g. if you press down D3-D2-S1 in this chord sequence, - D3 will be mapped to block 1 with the default tall preset, - D2 will be mapped to block 2 with the default short preset and - S1 will be mapped to block 3 with the default short preset.

Now you might ask: “But what if I don't want to use the largest default preset?”

Using Launchpad In Fl Studio

After a channel has been laid out you can cycle between all the presets that can fit into its space. This won't reflow the layout, even if you end up using a smaller preset. To cycle between presets - press Ctrl + Channel Selector to cycle forward, - press Shift + Channel Selector to cycle backward or - press Ctrl + Shift + Channel Selector to revert to default.

The cycling order is the following: - primary: large to small - secondary: default then all others in fixed but not specified order.

See, not that complicated after all. Let's see the actual presets that are featured out of the box:

Dubstep Launchpad Using Keyboard

<sup>1</sup> No identification with actual persons (living or deceased), places, buildings, and products is intended or should be inferred.