Re: [Rosegarden-devel] Phantom note when starting Rosegarden session

[Mark K. <mar...@at...>]

I'm surprised! No response? Not interesting?

On Mon, 2003-01-13 at 19:03, Mark Knecht wrote:
> Hi,
>    I'm seeing a sort of strange problem. It has been evident for a few
> weeks in the tune Doing Time that I brought over from Pro Tools, but I'm
> just now getting around to asking about this. It will be slightly
> difficult to explain in detail, but I will try in a following paragraph.
> The basic problem appears to be a note getting sent that is not in the
> event list. I cannot be absolutely sure about this, as the correct
> operation of the note causes no sound, but there is ample evidence that
> it is sent. (I think!)
> 
>    Is there any history of this sort of thing. Any ideas how I might
> make sure this is really going on?
> 
>    OK, here goes...
> 
> BACKGROUND
> 
>    GigaStudio supports multiple samples per note. The most normal use of
> these samples is to have multiple volume samples. This works
> particularly well for instruments like pianos, where if you play a note
> loudly you not only get a louder note, but you get more resonances from
> the other strings on the keyboard. It's also used for the difference in
> sound between a note hit and held with the sustain pedal up (little
> extra resonances) and the sustain pedal down. (Much extra resonance.)
> 
>    One special use of this capability is a feature called ' Key
> Switching ' With Key Switching a library can be made to change
> completely for the same basic MIDI notes. The trick is that the key
> switch notes cannot have a sample attached to them.
> 
>    One of my favorite libraries for the bass guitar makes heavy use of
> key switching. Let me assume that the key switch range is C1-G1. (From C
> two octaves below middle C up to G.) This gives you 8 notes to key
> switch with. Sending a MIDI event between C1 and G1 completely changes
> the sample set. After sending C1, all notes in the sampled range (Say E2
> - E5) will be long, sustained bass notes. However, if I send a G1 (the
> highest key switch) I will get little trills played on the bass. There
> are 6 other sample sets in this library.
> 
> PROBLEM STATEMENT
> 
>    When first loading a session in Rosegarden and playing it for the
> first time, the bass in Doing Time always plays the wrong sample set,
> and always plays from the same wrong key switch. The default state of
> GSt with this library, when used with Pro Tools, is that the sample set
> that corresponds to the C1 key switch will be active. The first time
> this RG session is loaded I always get the G1 sample set.
> 
>    If I then manually send GSt a C1 key switch the session will then
> correctly play the right samples until the session is saved and
> reloaded. 
> 
> QUESTIONS
> 
>    Has there been any reports of problems like this? Remember, you
> wouldn't necessarily hear the note if the MIDI volume was sent as 0.
> 
>    Also, how can I debug this or provide more data for you to solve this
> problem. (And it is a pretty serious problem with GSt.) I suspect that
> some notes might be sent when RG is first started. Or maybe there are
> notes in a software buffer somewhere that need to be cleared out and not
> sent.
> 
>    Thanks in advance for reading through this.
> 
> Cheers,
> Mark
> 
> 
> 
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