Rockbox Ports are now being developed for various digital audio players!
However, when choosing source for recording in the native iRiver firmware you may choose between internal mic, external mic (through the line) and then the line-in. So, there must be a diffrence in external and line-in setting.
Some Canon camera mics have built in preamps, but be aware of the current ower 5V. I fried mine during experiments.
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