Hello again. I am wondering about the dimensions for an alto, tenor ad baritone bowed psaltery. All I ave ever built were sopranos. This summer I was commissioned for one, and just finished one for another customer. Both are 21" long, and 7" wide at the base. I used .010, .012 and .014 strings. There are 21 total. If I use that length, can I get an alto or tenor sound with different strings? The baritone is an interesting concept for me, as I sing baritone repertoire. String gauges? Thanks in advance.