[i]So, having a RC 50 is the equivalent of having 2 DL4?
At a Roland Store here I have asked about both DD20 and RC 50 about that effect of "decaying layers" and they have answered me they are unable to produce this particular effect.
Anyway guys, I trust you more than a shop assistant, who maybe doesn't have a clue on this special effect, so if you tell me any of both looper models can make it:
Would you please describe me exactly the settings to try them at the store today or tomorrow? [/i]
Not quite - the RC50 is special in that it's actually three synchronised stereo loopers in one box. The rest that have been mentioned (besides the giga delay, which is stereo) are all single-phrase mono loopers.
This means that you have three phrases all running at the same length that you can layer on to. You can't get rid of individual layers, but you can fade in and out of each phrase just by setting the start/stop modes to "fade" and then hitting the appropriate switch. This means that you can fade and phase between different stretches of a piece of music if you wish. My recommendation would be to find the biggest constant in the piece and keep it on an isolated loop while you move between sections with the other two phrases... if that makes sense...