Hello, I've been using chuck 1.3.1.3 on OSX for quite a while now without any problems $ chuck --help chuck version: 1.3.1.3 (chimera) mac os x : intel : 64-bit but I just tried configuring the adc for the first time and it is not working for me. $ chuck --probe [chuck]: found 4 device(s) ... [chuck]: ------( audio device: 1 )--------------- [chuck]: device name = "Apple Inc.: Built-in Microphone" [chuck]: probe [success] ... [chuck]: # output channels = 0 [chuck]: # input channels = 2 [chuck]: # duplex Channels = 0 [chuck]: default output = NO [chuck]: default input = YES [chuck]: natively supported data formats: [chuck]: 32-bit float [chuck]: supported sample rates: [chuck]: 8000 Hz [chuck]: 9600 Hz [chuck]: 11025 Hz [chuck]: 16000 Hz [chuck]: 22050 Hz [chuck]: 32000 Hz [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: 88200 Hz [chuck]: 96000 Hz [chuck]: [chuck]: ------( audio device: 2 )--------------- [chuck]: device name = "Apple Inc.: Built-in Input" [chuck]: probe [success] ... [chuck]: # output channels = 0 [chuck]: # input channels = 2 [chuck]: # duplex Channels = 0 [chuck]: default output = NO [chuck]: default input = NO [chuck]: natively supported data formats: [chuck]: 32-bit float [chuck]: supported sample rates: [chuck]: 8000 Hz [chuck]: 9600 Hz [chuck]: 11025 Hz [chuck]: 16000 Hz [chuck]: 22050 Hz [chuck]: 32000 Hz [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: 88200 Hz [chuck]: 96000 Hz [chuck]: [chuck]: ------( audio device: 3 )--------------- [chuck]: device name = "Apple Inc.: Built-in Output" [chuck]: probe [success] ... [chuck]: # output channels = 2 [chuck]: # input channels = 0 [chuck]: # duplex Channels = 0 [chuck]: default output = YES [chuck]: default input = NO [chuck]: natively supported data formats: [chuck]: 32-bit float [chuck]: supported sample rates: [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: 88200 Hz [chuck]: 96000 Hz [chuck]: [chuck]: ------( audio device: 4 )--------------- [chuck]: device name = "Apogee Electronics: Jam" [chuck]: probe [success] ... [chuck]: # output channels = 0 [chuck]: # input channels = 1 [chuck]: # duplex Channels = 0 [chuck]: default output = NO [chuck]: default input = NO [chuck]: natively supported data formats: [chuck]: 32-bit float [chuck]: supported sample rates: [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: [chuck]: [chuck]: ------( chuck -- 0 MIDI inputs )------ [chuck]: [chuck]: ------( chuck -- 0 MIDI outputs )----- [chuck]: $ chuck --dac:3 --adc:4 --srate:48000 --loop [chuck]: unable to find adc '4'... [chuck]: | (try --probe to enumerate audio device info) $ chuck --dac:3 --adc:3 --srate:48000 --loop [chuck]: unable to find adc '3'... [chuck]: | (try --probe to enumerate audio device info) $ chuck --dac:3 --adc:2 --srate:48000 --loop [chuck]: unable to find adc '2'... [chuck]: | (try --probe to enumerate audio device info) $ chuck --dac:3 --adc:1 --srate:48000 --loop [chuck]: unable to find adc '1'... [chuck]: | (try --probe to enumerate audio device info) $ chuck --dac:3 --adc:0 --srate:48000 --loop [chuck]: unable to find adc '0'... [chuck]: | (try --probe to enumerate audio device info) $ chuck --dac:3 --adc --srate:48000 --loop [chuck]: (CoreAudio) timeout waiting for sample rate update for device (2)... [chuck]: cannot initialize audio device (use --silent/-s for non-realtime) $ chuck --dac:3 --adc --srate:44100 --loop [chuck]: (CoreAudio) timeout waiting for sample rate update for device (2)... [chuck]: cannot initialize audio device (use --silent/-s for non-realtime) Same without the Jam connected, or with Apogee ONE connected, or with Presonus AudioBox USB connected. Am I just missing something? michael