Big fan of this app - definitely something I'll make use of. One idea though: something that as a singer I would find useful is the ability to select a single

Big fan of this app - definitely something I'll make use of. One idea though: something that as a singer I would find useful is the ability to select a single base note and practice against that but without the base note being played each time - if that makes sense. This would be handy because a big challenge for singers (or players of instruments without clear note separation) is placing the notes you hear relative to the key you're in. I realise it's a lightweight app and making it too feature-rich wouldn't necessarily be a good thing, but I know a lot of people would find it helpful.