Lowboy, it’s not the amplifier, microphone, pedals or for that matter the melodica, It’s acoustics. Your sound is going to change with every room you play in. Your sound will even change in the same room once you add people. So as the saying goes “Adapt and overcome” if you can’t get the sound you want, play the sound you got. Your amplifier, microphone and pedals will defiantly help to control when playing in a band, unless it’s you a ukelele and a kazoo at that point does it really matter?. At the jam sessions I go to sometimes, I get a chance to play on the fly and work my equipment and learn to find my sound. Your sound for live is actually quite good.
We are our worst critics and that’s a good thing.