Thanks to @DJ MiCL, we have a clear explanation of what "Blend" REALLY does: I only found one incorrection in this explanation: booleans have specific rules when Blend=OFF. If this would NOT be the case, the most common setup would fail: ... IN MIN 0; MAX 1 ... OUT MIN 0; MAX 127 In this example, it was supposed to send MAX in all cases; but it doesnt. ---- Confusingly, "Deck is loaded" is buggy. Maybe other booleans are as well. There, the non-boolean rules apply, so this will always send 127, even after an explicit unload. Latest CMDR has a column to filter Blend=ON or Blend=OFF. This is useful to find and fix Blend issues in your existing mappings. Below a small test to understand the explanation for the case of a Modifier counter.