I was unable to get the PSR-S910's sequencer to generate Sondius-XG midifiles, finding no way to override the selected PSR voice with the requisite Bank Select MSB 97, LSB 112 thru 119. These activate the VL-XG mode of the VL70m and PLG150VL but are treated as Bank Select MSB 0 LSB 1 (Key Sensitive Panning or suchlike) by all non-VL XG synths.
