In two of 21 Rackspaces, Midi Input DSI REV2 (CH2) don’t receive CC7 (Volume) from expression pedal connected to DSI Rev II. That two rackspaces have each two Midi Ins from Roland A88 (CH1) with split settings (picture Rackspace 4 + pict. Rackspace 18).
In all other Rackspaces there are only one Midi In Roland A88 and Midi In DSI REV2 (pict Rackspace 1). In that 19 Rackspaces, Midi In DSI REV2 receive CC7.