mrw wrote: > I have made a modified sound effect. Using the on-board sound effect > bump.wav as a base, I made one lasting for about one second. Then, > while playing a 48,000 sample rate stream, I repeatedly press the back > key and generate lots of (longer) bumps. At the same time, looking at > the log with tail -f /var/log/messages. > > From time to time, various Alsa under-run messages appear. And, perhaps > about once in every ten or twenty messages, I am rewarded with bass amp > drop out. Patience is required. Sometimes you get lucky relatively > quickly. > > After increasing the buffer size to 30,000 and the period count to 3 > (from the default 20,000 and 2), I am unable, at least so far, to > provoke the Radio enough to drop out its bass. I think the additional > 10ms headroom provided by the extra buffer is just enough to allow it to > ride through the storm. > > If you can find a better method to provoke it, please let me know ! > > Basically, I think the Radio has enough umph to play out any 48k stream > that I have given it, keeping Alsa sufficiently supplied with frames. > But it seems to get close to the edge when dealing with a sound effect. > And, if it should fall behind and leave Alsa short of a frame or two, > then the crossover (for reasons unknown) may sometimes/occasionally lock > itself into silent bass. Note that the hardware bass channel is still > functioning (in my experience), which you can verify by turning the > crossover on and off.The only sound effect I have turned on is the charging > beep which would explain why the bass dropped out when I plugged the Radio in recently. It does also seem possible for the bass to drop out without a sound effect being played. It can randomly happen for no obvious reason.
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