Not sure exactly what you are after, do you have WAV files which you want to combine to make a voice, or do you just want to trigger WAV sound effects from the keys.

If you want to create a voice, then there is a lot of work involved to get it working. (You can’t just assign WAV files to keys and expect to create a voice)

If you want to trigger sound effects, then any Drum Sampler (Most will accept WAV files) will do, as they will allow you to easily assign sounds to the keys.

Hope this helps

Bill