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I use iFretless Guitar and Bass apps for this. They support virtual midi and can control whatever synths you like. Some of the guitar samples in SampleTank are quite nice. Of course via AudioBus and MidiBridge I record both the midi and audio into Cubasis as I play. Putting Ampkit into the effects slot greatly enhances the sound.
I really don’t want Cubasis to become bloated with features that are already provided by dedicated, and cheap, apps.