You specified h1xx series. . . . Has anyone here had the noise issue with h320?
I just found this in the iRiver FAQ. Sounds interesting:
[170] Does using the remote introduce interference?
Yes. It seems on most units that having the remote plugged in during recording does introduce a ticking noise, which is only really noticeable when amplified. For example, with no gain the extra noise is about 3dB. So if you're using an external pre the issue is moot. However if using the iriver's pre at quiet gigs for a lot of gain (eg about 30dB), you may notice the extra noise.