Problems w/in-app purchase – Mobile Music Sequencer - US Review

Update: Nothing plays when "Play" is pressed. App no longer produces any sound. Purchased QY module but can't seem to get it recognized as installed. Restore purchases does nothing, and I get the message of would you like to buy for $7.99... again upon pressing [$7.99].
Review by TriedTo on Mobile Music Sequencer - US.