If you're trying to get somewhere with your band, your singer really needs to shine. Most non-musicians will judge your entire band based on the vocals. The hard truth,imo, is you shouldn't have made a C.D. with this singer. You're giving your seal of approval on someone who simply doesn't deserve it and it compromises your integrity(if your trying to be a pro band). I'm giving my opinion because one of my "flaws" over the years(repeatedly) was hoping,wishing,wanting to see what I thought was potential in singers and it didn't ever bare fruit. If you're in your early teens and just starting out , that's fine. That's not the case here. In my experiences, my first impression was always correct. I , like you, would try and see some sort of glimmer of hope and buy into all the excuses as to why they weren't that good and I'd hope that with time they'd get to where they needed to be. Huge mistake on my part and I did it repeatedly. You have to take musicians/singers at face value. If they have it, fine. If not , you have to keep in mind that you'll most likely waste months or years only to realise that your first impressions where correct. Wanna guess how that feels ? If you can play in tune, shouldn't you play in a band with a singer that can ? After about a half dozen times and decades later, you'll wish you had that ability to see through the b.s. Trust me on that. All the excuses as to why he hasn't become a good singer really shouldn't matter to you. The fact is he hasn't and your time is extremely valuable (or it flippin' should be !). All musical decisions should take priority. I hope this helps and keep in mind that there is always time to correct a personel change even if it takes months. Be strong, bro.

- just joking -