How many years has it been since its been requested to allow a simple hz change feature to be added. Now you have these generic apps that only provide that one feature (or more) with a download rate total of over 20 million and growing (oppotunity cost). Of course, there is difference between download rate and use rate but the same argument could be used against you. You want customers to listen to the artists music as faithful as possible? Who do you serve then? The artists that make music or the people that pay for your app to listen to music. Only one of the two put food on your table.
Just add the ability to allow customers to be able to change frequencies (415, 420, 432, 440, 452) of the music they listen to already. Its been 7ish years since the first request for ___ sakes.
sincerely, paid user for 5 years.