Let’s face it, the manual that comes with the motif rack is a joke (without a punchline and any humor). I have more questions about how to use it to its fullest than can be asked here. Is there any literature anywhere that will go into the details of using this piece of equipment?

These may help:

http://files.keyfax.com/PDFs/Motif_rackFX.pdf

And this from the Motifator archive article on Motif-Rack USER MULTI Navigation:

“You can initialize a MULTI using a [JOB] function. JOBS are found under the [UTILITY] button. When you press [UTILITY] you will find a number of PAGES. Use the PAGE LEFT/RIGHT buttons to navigate the UTILITY mode. By paging to the right you will ultimately arrive at the [JobSel] or Job Select screen. The top JOB is INITIALIZE, use the UP/DOWN cursor arrows, if necessary.”

If you want to work with a Performance Multi it explains how to get to the EDIT parameters you need (specifically MIDI Receive Channel):
“.....The detailed edit layer is viewed by touching [EDIT] while in MULTI. This will give you access to the full compliment of edit parameters. And like its sister products the Motif and S90, there are two levels of editing within the MULTI area:

COMMON - parameters that apply overall settings
PART - parameters that apply to individual PARTS of the MULTI

To toggle between COMMON EDIT and PART EDIT when in a MULTI, the [MUTE/SEL] LED must be OFF (select). You can reach “COMMON” by holding [SHIFT]+[COMMON], you can only reach PART select when the [MUTE/SEL] LED is OFF, then hit PART to see the PART level of editing.

This button is either SELECT or MUTE.

The [MUTE/SEL] button is another important function to become familiar with using. When [MUTE/SEL] is lit the PART buttons can be used to temporarily turn ON and OFF PARTS (mute). There are five Pages of data (Voice, Output, Tone, EQ and Receive Switch):

Voice - in addition to Bank, program number, you will find, the poly mode, arpeggio switch, MIDI receive channel, note limits, velocity limits, portamento switch/time/mode, pitch bend range, and velocity depth/offset.

Output - here you will find the volume and pan combined with the effect send parameters: reverb send, chorus, send, dry level and output select (L&R;or to the assignable outputs).

Tone - includes note shift (transpose), detune, filter cutoff, filter resonance, filter EG, filter ADSR (attack, decay, sustain and release), and amplitude ADSR.

EQ - each Part has a 3-band equalizer: low frequency, low gain, mid frequency, mid gain, mid-Q (width), high frequency and high gain.

Receive Switch - this section shows you what controllers are active for each Part: bank select, program change, control change, pitch bend, channel aftertouch, breath control, assignable device 1 and 2, foot control 1 and 2, volume, pan, sustain pedal, and foot switch.”