![]() ![]() Even still, the model ended up in development for over a year – but the H910 is a signature Eventide piece, so we really wanted to make sure we got it right. Tony was the original designer of the H910, and having his insight was incredibly important to the modeling process. It turns out that this had a significant effect and definitely adds to the uniqueness of the sound. ![]() Tony thought about it slightly differently than you might as a C++ developer or even in assembly code. I believe this is because the H910 didn’t have any microprocessor and instead was implemented via discrete CMOS logic gates and shift registers. Then finally, the pitch shifting algorithm itself is really different from the type of time domain pitch-shifters you might normally write in software. The clock that generated these sample rates was also susceptible to drift which is a key factor in creating the pleasant chorusing sound it became famous for – represented by the visual drift in pitch shift ratio on the GUI display. This creates changes in system bandwidth depending on the setting. Because the H910 is not a purely digital device and predates any standards for digital audio sample rates, it works by running the D/A converters at a different sample rate than the A/D converters, depending on the pitch shift ratio. ![]() The A/D convertors themselves are discrete devices designed by Tony Agnello leveraging an earlier design created by Richard Factor for the DDL1745. Tony Agnello’s signature on an H910 Harmonizer® board, circa 1976 ![]()
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