Hi Saxomonica – i did the melodic improvising course last year, it has been renamed since then. i just went for the 90$ option which is a self study instead of the $300 online with feedback. Didn’t regret doing it, just enjoyed doing something different with the sax.
singing by numbers is very useful, my sax teacher had me doing that 2 yrs ago, i think it’s a requirement in the abrsm sax exams that students do through the grades.
he also tested me by playing up to 5 notes on his sax, and then i had to replay the same notes on my sax by ear, i managed to do better than i thought. It’s just practice.