I am working on this counterpoint exercise. In 9a the second half goes down. I for the life of me can't do contrary motion without it going too high. I know I need 16th notes but there are too many. I know I need to start with the octave or unison. But from there I am stuck
Starting at the octave is definitely going to be easier.
I've submitted an example of avoiding voice crossing, but I just noticed that you think you need 16th notes. The second species is 2:1 so I would have expected eighth notes against quarters and vice versa.
Also, I had to wipe my computer recently and I rushed to install notepad which doesn't support 6/4 but luckily did have 12/8. :-(