AMPWALL is currently invitation-only
Which email address should I use?
You can use your professional email if you want, but a personal email account will allow this be your account for buying stuff in addition to managing artists and labels. Once you add artists or labels to the system, you'll be able to grant access to other users' accounts.
Is this my username or my artist/label username?
If you're using your band email address, you might want to use your band name. But if you're using your personal email, your username should be for you.
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