The Keith McMillen QuNexus is a very flexible controller with great software. Even though its main function is a computer USB controller, at which it excels, it also is equally capable in MIDI 5-pin (with the expander) or CV control modes. It will even function as a MIDI-to-CV & CV-to-MIDI converter.
What I’m doing now is using the QuNexus to trigger arpeggiators on separate patches in multimode on my Waldorf Blofeld. Because of the software included, you can route any controller and any channel to any key or range of keys. In addition you can set the keys to “latch” mode so that you can trigger patches and have them stay running until you press the key again. Generally I route the bottom three or four keys to separate channels, in latch mode, and then assign my sound programs (each of which has an arpeggiator) to those keys, allowing me to trigger them like I would on a sequencer. Then, I route about an octave in the middle of the keyboard for the bassline, which I hold and change while performing. I usually leave around five keys above and below this middle section for other parts, so that I can have multiple melody or rhythm lines running, making sure that their transpose range is assigned properly so it matches the key of the main bassline. If I don’t need a full octave for a bassline, I’ll sometimes assign it to the five keys below the main section, or if I need a number of different arpeggiators or samples, I will assign each of those five keys to separate patches.
In one of my more complex tracks, I assign the bottom three keys to a kick, snare, and hihat. With the next four keys, I assign each to a different one-shot sample which I trigger by hand when I want a drum break or want to trigger the vocal sample (to use samples you need the full keyboard version of the Blofeld or LicenseSL). The next section of keys I’ve assigned to a sort of “wub” bass, and the top section is an arpeggiated melody track that lays over the top. For the “wub” bass, I’ve set a modulation slot to vary the speed of the wub sound and then set up the tilt controller so that I can alter it live, and the upper melody section is set up similarly, except tilt acts to raise/lower the pitch of one of the oscillators. It has nine separate programs assigned to this multi, which gives me plenty of variety when trying to make dynamic, live performances.
Of course, the QuNexus is not a sequencer, so it takes practice to trigger the arps exactly on time, and there is even sometimes a bit of a lag in the arp “catching,” but with practice it is doable, and it’s even possible to trigger an arp at a different point in the measure than on the first beat of the measure so that you can creatively alter the rhythm as well, depending on exactly when the arp is triggered in the phrase. In addition, any samples that are set up stop playing as soon as the key is released, so it is easy to say trigger the first part of a sample but not the last part until you hold the key a bit longer.