Launchpad

You’re asking more of a software question than a hardware question — but generally speaking, you’d just plug the Launchpad’s USB into another port on your computer. Sound would still come out of your SX as the Launchpad has no sound card.

Now, the real question is what software are you using and what do you want to do with the Launchpad. For example, I use Virtual and use the Launchpad as a trigger for samples and video clips. I have the output mapped to a channel on my mixer. In Virtual it’s just a matter of setting a few items in the config and tweaking the mappings how you like them.

Set the sound output from Ableton to one of the channels on the SX (it has 4). Then you can use that channel for your launchpad.

In Ableton, the sound card in the SX should show up as a 4 stereo channel sound card. Check which channels are NOT used in your DJ software and assign one of the free stereo channels to the ableton output. I don’t know where the “master” comes from.

Under Audio Output Device is a header name Channel Configurator, I’d like to see what that says when clicked on Output Config

No, ableton doesn’t “do” master out, headphone out, it’s not DJ software. It just sends your output to whatever channels you set it.

As the SX is indeed 4-out, there should be more buttons for the SX, probably labelled something like 5/6 stereo (channel 3 on the SX) and 7/8 stereo (channel 4 obviously). If you’d set either of those in Ableton and the corresponding channel on the SX to PC (front switch), then that channel would be dedicated to playing whatever output you have from Ableton without rerouting anything. You could probably even choose both channel 3 and 4 and have TWO outputs for Ableton (if this helps in some way).

Clearly you will not have any of the benefits of it being the live input for your DJ software (which is the route you were showing), but the question is if you want this at all (do you need all the FX when playing stuff from Ableton – I have no opinion either way, just saying you need to ask yourself this before chosing which way to go).

If you can do without routing the ableton signal through the DJ software and just use a single stereo channel for output, the way I described it should work.

If you do need to route through your DJ software and the software supports taking USB inputs and use them as “live” inputs on decks, then it could be prudent to have a simple stereo sound card for the Ableton master signal, run RCA-RCA from the sound card to the line in on channel 1 or 2 on the SX and set your DJ software to use that signal as “live in”. For test purposes it would work also by setting the onboard sound card to master out for Ableton, run a mini-jack to RCA into the SX channel 1 or 2. Not 100% sure about the routing. I think you can’t use the CD in on channel 3 and 4 for live input, but if that works you could even use those two channels.

So, in theory both options should work, one giving you the clean master signal from ableton that you can then run through a controller channel with EQ and fader, the other giving you the Ableton input as an extra deck in your DJ software letting you treat it like any digital file, adding FX and what have you.