Alright everyone, let me re-do this one because the original post didn't do justice to how serious Eventide is being here — and you should too if you use harmonizers. This isn't just "ARM processing" as a marketing buzzphrase; it means two ARM SoCs under the hood (Cortex M4 plus Cortex A7), which gives this thing enough headroom to run complex pitch-shifting chains with zero audible buffer latency, something that plagues almost every other digital harmonic processor on the market. They've also ported all 35 H90 algorithms onto it alongside the original 162 harmonizer algorithms from their earlier catalog — we're talking nearly 200 total models available in one pedal, and each one of them is a dedicated DSP algorithm tuned for specific harmonic styles (call-and-response, double tracks, pitch shifters) rather than some generic global effect. That alone makes it more versatile out the box than half their competitors combined.

Physically it's built like they know guitarists actually play live — stereo true bypass outputs, buffered/unbuffered switching, an OLED display with a readable top-down layout, and 128 user presets so you can save specific patch configurations without reloading programs mid-set. It also features a dedicated LED ring around the rotary encoder to track modes at a glance in low light and a touch screen navigation menu that keeps everything accessible under pressure. I think this is one of those rare new products where the tech specs actually translate into real performance benefits you can hear, not just bigger numbers on a spec sheet — it delivers clear, phase-accurate harmonies with virtually no artifacts from time stretching or pitch shifting. If your tone relies on harmonic layers and you've been waiting for a modern implementation that doesn't lag or degrade the high end at scale, this is probably the one to watch.

Source: https://www.musicradar.com/guitars/eventide-h9-harmonizer-gen-2-multi-fx-pedal