I’m a Radio Music fan - it’s here to stay, so the card player doesn’t get a look in in my patches on the ER-301.
However, the way I use it is to be able to access long audio files and trigger small sections of them by modulating the start point and then send the output to the Tyme Sefari/Sound of Thunder - my other sample recorder that I consider to be the total antithesis to the ER-301. It’s nasty, gritty and broken… I love it!
Sure you could probably recreate similar textures and degradations in the ER-301, but it would take some patching and actually the full functionality is not there, would need start and end pointers to loop between and the ability to turn looping off and back on again. A few circuit bending algorithms and it would take up all the patch points on the ER-301 too!