Channels in mixer not showing

Does anybody know why only a few channels in the mixer is showing? (I use NotePerformer). I am working in a orchestra score, but only 4 channels are showing. When I solo one of them, several of the instruments plays solo, others are muted.

Noteperformer uses its own mixer (There are numerous threads on this topic).
Open it using the edit instrument button (‘e’) in Play mode.

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To solve this, I uploaded the playback template described in this thread, but I experience annoying lagging from high CPU: Playback Template: Individual Mixer channels for NotePerformer