TTSoundfileLoader::test() - test 8 replaces old test of optional load parameters. see #193
TTSoundfileLoader::test() - clarifying some variable names & error feedback
TTSoundfileLoader::test() - added testing across multiple audio channels. exposed problem w TTSampleMatrix::getValueAtIndex()
TTSampleMatrix::getValueAtIndex() - fixed bug found in commit 8b427cb
TTSampleMatrix - remove calls to deprecated TTValue::get()