The number of frames in the Silver Screen v.1.6 is the same as Harmys 2.7 and each frame from both editions have the same frame number. ( JEDI TRANSLATION: Both editions are GOUT sync’d to each other).
So, the answer to your question is yes—-all the audio options from Harmy’s 2.7 will play in perfect synchronization with the Silver Screen v.1.6 when muxed.