I want to tune my Scandalli Extreme P accordion which seems to have tunning issues since from the factory. I'm a little bit afraid of tunning such an expensive accordion on my first tunning, so I decided to try to tune some Weltmeister. My favorite registration on Scandalli is LMM. It's more empty register (LM) and the switch is turned on (additional M). Basically with the switch turned off, notes sound pretty well, they become worse when I turn on the switch. I managed to successfully block all the reeds of E note by applying tape on an external reed and corresponding leather (in order to block the note while pulling or pushing bellows) on Scandalli, except that one which is activated by the switch (another E2). I tried to do the same thing on Weltmeister and it seems that I blocked all the octaves of Bb note and it no longer sounds when I pull or push bellows weakly but Weltmeister doesn't have a switch, It seems to have only one M. How can I locate that E2 reed that is activated by the switch on Scandalli? It seems that I can't remove the reed block on Scandalli, so it's hard to understand what happens inside. Before trying to block Weltmeister reeds I thought that the switch reed is that under the leather of non-switch E2, but Weltmeister looks to work in the same way, but it doesn't have a switch.