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c55x Connected Audio Framework - 16kHz sampling frequency

csc
Prodigy 80 points

I'm trying to change the sample rate (for both playback & recording, USB and audio codec) from 48kHz to 16kHz in the c55x Connected Audio Framework. I have

in app_usbac_descs.h :

#define REC_SAMPLE_RATE (RATE_16_KHZ)    /* audio record sample rate */
#define PLAY_SAMPLE_RATE (RATE_16_KHZ)   /* audio playback sample rate */

in psp_i2s.h :

#define SAMPLE_RATE_RX_16kHz
#define SAMPLE_RATE_TX_16kHz
#define SAMPLE_RATE_I2S_16kHz

But I can't get playback to work - the program hangs when trying to play something (the program counter ends up somewhere far away in memory). Recording seems to work though.

Any ideas?

Thanks in advance!