Band: opinion spread · Dot: weighted average
Sources split: both German magazine tests, DTM Station and many owners found the USB receiver seamless — no perceptible latency, rooms away from the computer — while a large minority of owners report notes that hang or drop out, sometimes every few seconds, sometimes once a gig. The split is not random. Owners trace hangs to low or rechargeable NiMH batteries, crowded 2.4 GHz rooms, a receiver hidden behind gear, and early firmware that Alesis patched in 2018; a powered USB hub and fresh alkalines help in many reports, though some owners still see stuck notes over the USB cable. Beyond the radio, the wired options are plain: USB-B and a 5-pin MIDI Out, no sustain-pedal jack, no Bluetooth, and the receiver needs a computer or a USB-host port on the other end.
Measured
Maker: a proprietary USB wireless receiver that is “always paired”, class-compliant with no drivers, plus a USB-B port and one 5-pin MIDI Out (Alesis FAQ and spec sheet). Hands-on checks: AMAZONA felt no latency anywhere within 10–15 m; DTM Station felt no difference between wireless and USB; Airwave Music hit trouble beyond 3–4 m and advises staying within about 2 m; IbandUK advises about 5 m with the keytar facing the computer.
vs. listeners — Most of the split has a cause owners can act on: hangs track battery voltage (NiMH rechargeables run 1.2 V per cell against alkaline's 1.5 V), 2.4 GHz congestion, receiver placement and pre-2018 firmware — two Thomann owners report Alesis's 2018 update ended the hangs, one of them revising a 2018 one-star in 2022. It doesn't explain everything: owners in 2021 and 2026 still report stuck notes with the USB cable.
“Die Bedienung des Keyboards ist sehr intuitiv und der kabellose Betrieb funktioniert einwandfrei.”
bonedo.de, Christian Frentzen (German: “operation is very intuitive and the wireless mode works flawlessly”)
“However, I find it to be very unreliable, as sometimes, when the batteries are low, the sound hangs.”
r/Keytar owner, “Trouble with Alesis Vortex Wireless 2”
