Hi! I was able to compile Chuck for OSS, but when I tried to compile it for ALSA, I got dozens of error messages on 'rtaudio.cpp': ++ -D__LINUX_ALSA__ -c -O3 -fno-strict-aliasing rtaudio.cpp rtaudio.cpp:3414:28: error: alsa/asoundlib.h: No such file or directory rtaudio.cpp:3421: error: ISO C++ forbids declaration of ‘snd_pcm_t’ with no type rtaudio.cpp:3421: error: expected ‘;’ before ‘*’ token rtaudio.cpp: In member function ‘virtual void RtApiAlsa::initialize()’: rtaudio.cpp:3452: error: ‘snd_ctl_t’ was not declared in this scope rtaudio.cpp:3452: error: ‘handle’ was not declared in this scope rtaudio.cpp:3453: error: ‘snd_ctl_card_info_t’ was not declared in this scope etc. Anyway, the OSS version seems to be working. I haven't tried any of the Unit Analyzers yet, that's the next step. Thanks for your help.