@administrator said in Doubling on alto trombone:
Which reminds me....Maynard had some kind of frankenhorn with both a slide and valves. Anybody remember what this thing was called?
It was a “FireBird”, Holton ST303. You can buy one from Gamin Brass on eBay for $14,000, or Berkley Winds, a Chinese brand, makes a facsimile that on eBay for $1250. A friend of mine has the Berkley model but pointed out to me that it’s trombone slide was also the tuning slide, therefore not very practical.