First, the manuals:
http://www.motifator.com/storage/sup...1_en_rm_a0.pdf (ref manual)
http://www.motifator.com/storage/sup...1_en_dl_a0.pdf (data list)
Then bear in mind that to record audio from the MX49, it must be set as your audio input interface.
The quick setup (UTILITY->JOB->Quick Setup) settings are worth remembering. Usefully one setting lets you record the output of the arpeggiator.