Help, how to profile AC30?

A mic input accepts signals from microphones or other devices that output at "mic level", which is very, very low. So those inputs include a preamp, which boosts the mic level by roughly 4 to 10 times.

I see that in manual:
You might notice audio clicks when you turn the “Return level”; this is the analog RETURN INPUT stage switching
the level in the analog domain, to ensure the best signal-to-noise ratio. This feature allows you to capture any
signal level, from the softest microphone to the hottest studio level output. Don’t worry too much about achieving
a perfect volume match; during the profiling procedure the “Return Level” will be fine-tuned automatically to
match the unity level of the Profiler.

THANKS and my apologies. KPA keep surprized my again and again.

Quote from elfredo

Hi, need advanced help.

wanted to profile my hardwired Vox AC30 with a Brian May Treble Booster in front and had to terminate the profiling session because of too much noise.

Signal chain: Guitar --> KPA --> Send --> TB --> AC30. MD421-Microphone --> Kemper return

The sound was not only full of noise (hiss and everything), but the sound of the guitar was also completely changed... not as harmonic as if i plug the guitar directly into the TB and into the AC30... much more disharmonic distortion in the high mids.

What am I doing wrong, how do you do it (in this special case)?

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first, I would remove the treble booster from the equation. Make a good Profile of just the AC30 to determine everything is setup correctly. (It's been done countless times, there is no shortage of AC30 or AC30-based amp Profiles.)

Then you could add the Profiler's treble booster onstead of your pedal, for now.

hth
Don

I had a similar issue with the Kemper when using a pedal. After a cold boot and resetting the return level it worked. Could be a bug? If I can recreate it, I'll email support.