When I looked at it, my impression is that 0.51 is correct
as it rounds up if the length of the note is more than 1/2 k-cycle.

I think that bit of the code is correct. The bug seems to be elsewhere.

----- Original Message ----- 
From: "Steven Yi" 
To: "Developer discussions" 
Sent: Monday, October 06, 2008 8:19 AM
Subject: Re: [Cs-dev] Csound5 glitching


> Hi John,
>
> Yes, I agree it's a BUG, and haven't denied that; I simply wanted to
> point out on the side that I think the CSD as written is a bit
> problematic, for the author's benefit.
>
> Anyways, I took a look at Csound 4's musmon.c and insert.c.  From a
> quick glance comparing sensevents in both csound5's Engine/musmon.c
> and musmon.c in Csound, I'm seeing this as a possible lead:
>
> [CSOUND 5 CODE in SENSEVENTS]
>      if (O->Beatmode) {
>        tval = csound->curBeat + (0.51 * csound->curBeat_inc);
>        if (csound->frstoff->offbet <= tval) beatexpire(csound, tval);
>      }
>      else {
>        tval = csound->curTime + (0.51 * csound->curTime_inc);
>        if (csound->frstoff->offtim <= tval) timexpire(csound, tval);
>      }
>
> [CSOUND 4 CODE in SENSEVENTS]
> if (O.Beatmode)
>            beatexpire(curbt + hfkprd); /* rm any expired instrs */
>          else
>            timexpire(curp2 + hfkprd);
>
> [CSOUND 4 CODE in BEATEXPIRE]
>  if ((ip = frstoff) != NULL && ip->offbet <= beat) {
>
>
> I think hfkprd is assigned .5 * ekr, while the check in Csound5 uses
> 0.51.  If this is the bug, I assume it was done for a reason, but
> don't know why.
>
> Note: This may not be it, just what I found in quick glance.
>
> Thanks!
> steven
>
>
>
> On Sun, Oct 5, 2008 at 11:54 PM, jpff  wrote:
>> The glitch is a BUG introduced in the rewrite on csound4 to csound5.
>> It is clear that there is at least one case when a note stops 1
>> k-cycle too early or a note starts 1 cycle too late.  I have chasing
>> it back but progress is slow (and it is a week into term)
>> ==John ffitch
>>
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