In this answer there is an interesting passage:
Also, Aristotle posited that the speed of sound was dependent on frequency. Gassendi had religious/philosophical issues with Aristotle's views, and one reason for the sound experiments was to prove Aristotle incorrect.
followed by an interesting comment:
Aristotle had no concept of sound "frequency", let alone "speed of sound" depending on it. He talks of air "falling upon and striking the air which is next to it", and is too vague to make sense of either the frequency or the speed. Those require concept of a wave, which came much later. And although Roemer was first to measure the speed of light successfully people suggested that light takes time to travel centuries before him. Aristotle mentions Empedocles, Avicenna and Alhazen also held such view.
I recommend going to the original question When was it first realized that sound travels with finite speed? and reading through it, and all of the answers there, as I am trying to do.
I almost asked my question in a comment, but then thought it might be interesting enough for a full answer.
While the modern concept of frequency would not be appropriate, did Aristotle suggest that different kinds of sound might travel at different speeds?
Did Pierre Gassendi later determine that different kinds of sound probably travelled at the same speed?