I was going to buy a denecke ad20 and ihp120d as a sound recorder but now I am far and far away from this concept.
You are making false assumptions. Read on...
The denecke ad20 has an optical spidf digital out.
The LCD remote causes
no ticking whatsoever during digital recording. None.
I would also remind everyone that the ticking is generally totally inaudible except when cranking the gain WAY UP. You'd hear it if you where trying to record cockroaches screwing or some other such low DB source material through the line input and didn't have an external micpre.
iRiver H1xx plus Rockbox plud external mic-pre/ADC/battery-box plus good mics is the best remote recording (stealth) rig on the market for my money.
Basically, the iRiver is not a pro or even semi-pro recording device without an external mic-pre/ADC, but with a good pre it does a great job.