hi jburns.
the ghost, rmc etc are very different from roland, yamaha, and axon pickups. the former are piezo and the latter are magnetic. one of the early problems was caused by a magnetic pickup having a latency issue due to the translation of the vibrating string above the saddle into a solid note signal the processor could understand and further do what the player intended it to do when they picked the string. this used to be 2-3 cycles, so low notes inherently had more latency than high ones. with a piezo (ghost rmc et al) the translation is far more instantaneous since the piezo saddle vibrates the instant the string is picked. i find the piezo pickups also have far less adjacent string cross over and far more dynamics when using palm muting. i have zero experience with baggs and fishman piezos for hex output. (i accept free samples for testing

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i'm not sure where you got the "generic" crystal information. when i order bulk piezo saddles from ghost they are all shipped in the same bag. there aren't E, A, D, G, B, e saddles---all come in the same bag. RMC saddles are a bit different in their placement of the piezo element in the saddle but the overall quality of the individual piezo elements are more than adequade for their job in both ghost and RMC. when you think about it, a piezo strip, like used under an electroacoustic saddle is in most cases one strip (ovation and perhaps others used 6 summed piezo element signals in their EA guitars). the same strip works easily for the entire dynamic range of the guitar. the piezos aren't rocket science and even if there is allot of variations in quality, you can bet at least ghost and rmc aren't vastly different in their approach to using quality components. they both have excellent reputations. the best processor in the world can't sound good if you feed it bad info. being on the cutting edge of guitar technology, they know the GIGO rule better than most.