AFAIK it can't be done "à la TMA" way. But Global Blocks could help.
EDIT: Actually, I might be done like this :
- record the AMP + CAB with custom settings
- replace the CAB with the TMA block
- use the recording as the reference for the TMA
- do the TONE MATCH.
- export from TMA to USER CAB
Thought I am not sure it can do a good match, since I understood (maybe wrongly) that the TMA was to overcome 10-20% missing in term of closeness to the looked after tone. So it might be to much to ask it to do more. Further the TONE MATCH is likely to be inflenced by the AMP type and settings used.
inaccurate and complicated, sorry - there`s a better way ... , let`s change the trigger-signal from "two times guitar playing" to simultan use of the identical testtone, like a sine sweep does...
Well you can use the tone match block to tone match a mix of factory cabs and their settings then export the tonematch data to a usercab, exactly what you needed
Right:
Place a Synth Block and connect output parallel to 1) your Cab Block (Reference) and 2) a Filter Block (Local). Pan Output of the Ca Block to right and the filter Block to left (that`s the only reason, we need it, rest should be default = null filter = no change in tone).
Behind these two blocks feed the outputs of them to a TMA block:
- set to ONLINE or LIVE (did forget te name, so NOT OFFLINE)
- Average time: Peak Hold
- Res.: High
- Block input Reference -> right, Local -> left
Synth Block:
- set off: voice 1 & 2
- Voice 3: Sine, Track Off, Filter 20000Hz
- connect Frequency to Modifier -> LFO
= Now in fact, you`ve created a Sine-Sweep (like it`s used for IR-Capturing). This is the testone for frequency-response measurement.
Do a tonematch and export the tonematch as User Cab. Do A/B test. If you did it right, your new User Cab will sound 100% exactly like the Cab, you have customized.
Note: Room simulation can`t be captured.
The same way you can Mix Cabs, add EQing,etc ... and Tonematch the result as new User Cab.