I've followed this thread lightly, I should've followed it closer I've a question for you - what version of hydrogen are you using, and how do you get it to sync to ardour? this is something I haven't had any luck with, and haven't even had a chance to spend enough time on, given how important it is to my setup... --------------------------------------------------------------- Houston Poetry Slam Team www.houstonpoetryslam.com NQuit Records www.nquit.com --------------------------------------------------------------- ----- Original Message ----- From: "James Stone" <stone1@xxxxxxxxxxxxxx> To: "A list for linux audio users" <linux-audio-user@xxxxxxxxxxxxxxxxxx> Sent: Tuesday, November 18, 2003 4:32 PM Subject: Re: [linux-audio-user] midi timing problems > On Sat, Nov 15, 2003 at 05:12:45PM +0000, James Stone wrote: > > On Tue, Nov 11, 2003 at 09:13:58PM +0000, James Stone wrote: > > > Hello everyone. > > > > > > I have a problem with midi timing.. I think I have set up enhanced rtc > > > correctly and low latency patch on kernel 2.4.20. > > > > > > When I drive hydrogen (or even the inbuilt soundfont player on my > > > SBLive) with seq24 or ardour, there is a noticable variation in midi > > > timing. This was tested by using a run of closed hihats. When I play the > > > sequence back, the hihats are grouped in batches rather than being > > > evenly spaced. This was noticable when running as root and when using > > > alsa and (to a lesser extent) jack. The midi connection is via alsa. > > > > > > Any hints on what I should do? > > > > > > James > > > > Just to reply to myself, > > > > I solved the problem: > > > > I needed to install the snd-rtctimer for alsa. This required a patch to > > the kernel RTC (patch included with ALSA but also needed a tweak. see: > > > > http://www.geocrawler.com/archives/3/12349/2001/7/0/6299315/ > > > > ) > > > > After that, snd-rtctimer built okay. Then I added the following to > > modules.conf: > > > > options snd-timer snd_timer_limit=2 > > options snd-seq snd_seq_default_timer_resolution=2000 snd_seq_default_timer=1 > > options snd-rtctimer rtctimer_freq=2048 > > alias snd-timer-1 snd-rtctimer > > > > Now, midi timing is sorted (at least for muse when running as root so it > > can access the RTC.. seq24 doesn't seem to be quite there yet in my > > experience). > > Just a further note.. Needed to apply the variable frequency kernel > scheduling patch and set the frequency to 1000Hz and now the timing > problem with seq24 is solved. > > James
