Pepperdecks has a range of useful accessories for mobile devices. First up are the Tuna Knobs, designed to add physical control for your touchscreen apps, literally stick on knobs. Buy em in pairs, or in a small flightcase in sets of 4 or 6.
We also saw a couple of mini two channel mixers, a prototype of Naga Viper an active mixer for two channels, Bluetooth connector and a pair of active filters - one for each channel. €89
And the DJocolate - a two channel mixer or splitter - one channel in to two outs (for maybe two sets of speakers) with passive Bass Kil Switch €39
Huge range, extremely flat response
Separate audio into separate tracks and groove away