Here is how I taught Ginger (a Beagle) to speak. Of course Hounds (Beagles and Bloodhounds too) love treats - even a little kibble of their regular food, so use it as an incentive for your commands.

Take a Kibble (one Kibble) in your hand - either left or right, but be consistent at first, and hold some more in your other hand. If your dogs sits, then start here. SIT - when he sits praise him and give him a treat. Now while his is seated, hold a Kibble between your thumb and forfinger (clearly visible) just above his snout but out of reach. He will turn his had upwards and be reaching for it. Slowly pull just out of reach and keep saying, SPEAK. He will lick his chops and maybe lunge at it, but be persistent. Don't let him have it. SIT him back down and start over. SPEAK. He will get so excited and frustrated that he will eventually bark. NOW you've got him. Just keep repeating this process over and over and pretty soon, he will know the routine inside out and will speak upon command. He will even speak when you assume the same hand position without a treat and say SPEAK!!!