If you want more midi/virtual instrument tracks in BB this may help
MidiLooper 32/64 Win/Mac
http://www.thepiz.org/plugins/?p=midiLooper
Use in MiniHost or Blue Cat's Patchwork http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=368498
each track can be to a different channel.
Load MiniHost in the Melody track,
generate up the midi in the Soloist track,
drag Soloist to DROP MID then drag into MidiLooper track 1,
generate up another midi track and drag to track 2 in MidiLooper, set them all to play and add your virtual instruments to MidiLooper's output.

Midi Channel Filters (use if the VI has no input Channel select from MidiLooper's output)
http://thepiz.org/plugins/?p=pizmidi
http://www.niallmoody.com/ndcplugs/ndcmidi.htm
https://jstuff.wordpress.com/2009/02/17/midi-channel-filter/

You can load just MidiLooper into a midi track but you will only have the available midi devices to choose from.

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BB_MidiLooper.jpg (492.75 KB, 193 downloads)
MidiLooper_Midi_Device.jpg (85.85 KB, 58 downloads)