The main track channel strip is represented by the kit name and icon, shown in the kit controls bar at the top of the Drum Machine Designer window.
Each subtrack channel strip is represented by a corresponding kit piece pad, shown in the grid.
Settings for the main track (kit) and all subtracks (kit pieces) are stored as a kit patch, which can hold multiple channel strips, each with its own instrument, effect plug-ins, and Smart Control settings. Plug-in settings, by comparison, can only hold the plug-in settings of a single plug-in.
A single subtrack with its instrument, effect plug-ins, and Smart Control settings is stored as a kit piece patch.
The icon shown on tracks and channel strips always matches the pad icon, and updates when a kit piece is exchanged or replaced. Double-click the track icon to open the Drum Machine Designer window. Click the arrow beside the main track icon to view or hide subtracks.
MIDI notes received on the main track are distributed to subtracks, according to the input and output notes assigned to the pads. This is true for notes played by PDF
Logic Pro Instruments: PDF