Yes, true, with the CC85xx, but we could use a generic LPRF device.
Here is an App Note for using the CC1101 at 900MHz, which could also be an advantage for longer range: http://www.ti.com/litv/pdf/swra237b . Similarly, at 2.4GHz: http://www-s.ti.com/sc/techlit/swra295 . Not high-quality audio, though, most likely voice quality.
Leonard