t.y.: "Was the feed back hard to deal with? If so, do you have any tips, that you learned?"
Plugged into the vocal jack on the Crate, the feedback was terrible. Had to turn the gain and volume way down. Standing behind the amp was not so bad. The H2N can be used as a mic, but I don't think it's that practical. It picks up too much, not directional enough for use as a PA mic.
Just something I wanted to try with the Zoom..
The test parameters (Kbps, gain setting, pickup mode, etc.) call for the H2N on a camera tripod, approx 3-4 feet from the sound hole, then try the different stereo and surround sound modes, then repeat trying the various kbps levels programmed into the H2N (44.1, 48, 96, etc.) and different gains. Then I play the same song on each guitar when stepping thru the parameters. The results are downloaded to a computer and folders generated noting what test parameters were used. Then I sit there and listen and compare the quality and the results and take notes.
All of this is to give me a frame of reference and some empirical experience in basic recording techniques.
I was doing some recording directly into Audacity using a cheap mic from the 1980's. This was cumbersome. The H2N is easier to use and more flexible in how it is used and where. (Actually, the cheap mic/Audacity thing was not too bad. But the H2N has better pickup and "sound resolution".)