I have the very setup you describe: Zoom H1 with 3350 lav. Perhaps I’m doing something wrong, but the sound level is quite low when using the 3350 as an external mic to the H1, compared to the H1 internal mic sound level. Impedance specs are 1000ohm for the 3350 and 2000 ohm for the H1. Could this be the problem? Also, the 3350 is mono, while the H1 input supports stereo, I think.
Sorry, I’m a complete nimrod for things audio; just got into this a month or so ago.