Fred’s Lab TOORO, Руководство пользователя и обслуживания

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2.2 A MIDI controller 2 REQUIREMENTS
2.2 A MIDI controller
can be any master keyboard, wind controller, surface... that sends MIDI notes. You can
also attach the instrument to a hardware or software MIDI sequencer. It can run on a
computer, a laptop or a tablet/smartphone. You may need a dedicated external MIDI
interface or just use the USB connection.
2.3 A USB power source
can be a USB host, a power bank or a USB wall adapter/charger. Never use cheap USB
chargers that can be very noisy.
2.4 Remarks on USB noise
If you keep hearing irritating hum and noise when the T¨ o¨ or¨ o is connected via USB, you
may experience a USB ground loop problem . Fortunately, there are several solutions
to overcome this problem.
Solution 1:
ˆ
Use another USB power source (power bank or wall adapter)
ˆ
Connect the instrument to the computer with a MIDI DIN cable
Solution 2:
ˆ
Use a USB galvanic isolator
Example: Olimex USB-ISO module
https://www.olimex.com/Products/USB-Modules/USB-ISO
MIDI DIN connections are, by design, prevented from ground loop problems. It is the
preferred solution to avoid these annoying issues.
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