Loq, thanks
Lee, nice picture :-D
Audionewb, i use 32G cards and internal memory is full and i have no issues. i never cared to swap for 64G card though.
edit:
btw, today compared C3 and RWAK... funny.... i can live with both since their sound signature is entirely different. i guess people liking purely analogue sound will prefer Colorfly ... C4Pro? C3 has midcentric presentation, rich timbres, well focused but has a narrower soundstage and less separation and black space is less black than RWAK. RWAK is spacious and buttery smooth with widest stereo imaging and amazing black space but lacks a bit in attack, dynamics and transients. i can see people preferring RWAK but for me both Colorfly and RWAK are a fun to listen. pity that C4 is mamonth size, otherwise i would be tempted to add one. both RWAK and Colorfly are keepers for me... even a small cheap C3 is a joy and easily bests iPods and Cowons in sonics.
so far i decided against AK Mod2, no point having two ... instead will wait for V-Studio 3rd Ann edition to add to my collection and perhaps Colorfly will want to update C4 in smaller easier and nicer package.