Not sure why you couldn’t use the Roger On In with your Marvels @steffner, e-mail Phonak and ask them? I have both Paradise & Marvel aids, 2 sets of Marvel, and 1 set of Paradise, with Roger x installer I can swap the licenses around, if I want to move the licenses from Naida P90’s to say, Naida M70’s, it doesn’t take long, 5 minutes maximum, I plug in a blank Roger x receiver, you have to remember which Roger x license is in which hearing aid (by keeping notes) these licenses are restricted to whichever Roger x receiver they came from, you cannot transfer a license to a different receiver, or indeed a different type of receiver! This all sounds fairly complicated, it is in actual fact a very simple process, anyway, procedures as follows, plug corresponding Roger x receiver into the Roger x installer, switch on, no green light will show, meaning the Roger x is empty, switch on the hearing aid you want to remove the license from, and place it on the Roger installer hearing aid symbol, it will start to flash green, it is removing the license, Roger x will now go solid green, the license has been removed and is back in the Roger x receiver…… Installing is much the same, fit the Roger x into the installer 3 prong plug, switch on, Roger x will show a solid green light, meaning it has a license, switch on your hearing aid, making a note of which aid it is, and from which Roger x, place on the hearing aid symbol on the installer, it will start to flash green, then solid green, the license is now installed in the hearing aid, the plugged in Roger x will now show no green light, meaning the license has been used! Apologies for the long winded explanation…… Cheers Kev 