I split your question about opening an Audacity project to a new topic https://forum.audacityteam.org/t/saving-premix-tracks/43397/1
So how did you solve your recording speed problem? It may help other users reading this to know. 
Gale
I split your question about opening an Audacity project to a new topic https://forum.audacityteam.org/t/saving-premix-tracks/43397/1
So how did you solve your recording speed problem? It may help other users reading this to know.
Gale