First finds real lumberyard, not Home Depot or Lowes, check and see what kind of woods they carry. Next the local cabinet shops, they can be a good source of hardwoods.
The tone channel looks like it was drill drilled too low, I had already guessed that your insert was not 5/8". That also explains the cork slot. Also looks like the jagged edge of the tonechannel was the jagged edge left by the saw, I don't think you had it securely clamped in the jig.
Marvn