Especially the case with the VP-03 when you absolutely need to use the USB (eg. to send carrier or format) and want to avoid USB hum, then, as for the series 1 Boutiques post their firmware upgrade, the VP-03 can be booted in "take power from batteries rather than USB" mode and I've found this reduces the hum significantly.
It's not covered in the manual, but I found that simply holding the "9" button whilst powering on is the way to go.
CB
VP-03 - force power from batteries when connected via USB
- cloudburst
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Re: VP-03 - force power from batteries when connected via US
Makes me wonder, how did you find this out ;-)
Albert
Albert