Levels and different kinds of splits in Helix Posted June 19, 2019 25 minutes ago, perapera said: Yes, I think you got it all wrong, sorry :) You should read it again... I wrote that the attenuation or the boost is happening at the merge block mixer not at the split I wrote that the a/b split "route to" parameter is not very well suited to mix between two different amps (or cabs) on the two paths, but just to switch between them and the acoustic power sum thing applies to... well acoustics, so we're talking real hardware speakers not the virtual speaker cabinets inside of helix Yes i got it that it happens in the merge., but i dont think that would matter at all in this subject since any db boost or attenuation happening in the split would end up being compensated by the attenuation/boost in the merge block. (since in this case we are not talking about preamps or dirt box that change its tone based on the input gain).. But either way " and the acoustic power sum thing applies to... well acoustics, so we're talking real hardware speakers not the virtual speaker cabinets inside of helix" may explain why the volume still changes... I will read it again when i get home to see if there's anything i have missed. But i think the main issue is already resolved ... I'd better create snapshots with different blends of the cabs and try to match the volumes instead of using the expression to control the route parameter of the A/B split It's way more laborious but at least i wont keep stuck in a method that will mislead me due to volume differences. Thank You!!!