the h1xx models have both digital-in AND digital out.
the h3xx have neither digital-in nor digital-out.
the h3xx has color-display, the h1xx monchrom-display.
its very easy to tape with rockbox and ie. church audio cards without a battery box or preamp.
just plug the mics to the irivers combined mic/line-in plug which powers the mics with 3-4V and set the rockboxed iriver recording settings to "AGC-safety-clip" starting with +15dB for left+right gain.
press start and hold button and enjoy the show;).
"AGC-safety-clip" is not THE known AGC we all know from md recorders which is good for speech but awful for music recordings.
"AGC-safety-clip" reduces levels when clipping might occur BUT
never boosts levels when a loud song is followed by a silent song.
it does exactly what any taper does when setting levels by hand without the "bad" known AGC algorythm.
here a 2 samples i recorded with my rockboxed iriver H140 and the church-audio cards+preamp. would not sound different without the preamp. only needs more normalisation in post.
http://taperssection.com/index.php/topic,84929.0.html