Abstract: A method for audio modification for a wearable device in operative Bluetooth communication with a device includes receiving a sound signal at a microphone of the wearable device, encoding the sound signal at a digital signal processor of the wearable device using a codec to provide an encoded audio stream, routing the encoded audio stream from the digital signal processor over a Bluetooth parallel simultaneous transport channel to the device, modifying the encoded audio stream using an audio modification software application executing at a processor external to the wearable device to provide an encoded modified audio stream, communicating the encoded modified audio stream from the audio modification software application executing on the processor over the Bluetooth parallel simultaneous transport channel back to the wearable device, and communicating the encoded modified audio stream from the wearable device over a Bluetooth hands free profile (HFP) channel to the device.