Momo Müller wrote in to share a TB MIDI Stuff layout he made for controlling the Elektron Model:Samples. The layout lets you immediately tweak individual track volume and FX sends. You can also use X/Y pads to apply effects and filtering to all 6 tracks simultaneously. The Elektron Model Samples Mixer can be purchased for $7.
The iPad "Model Samples Mixer" is an addition to the Model Samples Hardware. The direct access to the Volume, FX Send, Mute and Solo settings of all 6 Tracks allows you to control the Model Samples quickly and effectively.
The X-Y pads, which have main Functions (Filter, FX, Decay, Length) that affect all 6 Tracks at the same time, allow you to change the sound creatively.
The Model Samples is simply connected directly to the iPad via USB.