Fx send/track Routing

Think I remember reading post on this before. Can’t be done on OP right? Would love to be able to record the internal mic + op master fx to tape or album whilst other tape tracks are playing. Anyone figured out a workaround? Would be sweet if TE could refine/extend the options in this area a little. There are also a lot of times where I’d like to use the master fx as a 2nd fx unit for a synth sound etc but seems like this is only feasible on the first initial tape track that I record as it requires using ‘ear’ as source. Any advice on workarounds for this kind of stuff? Thanks