Currently Being ModeratedOct 17, 2012 8:33 AM (in response to keystrike)
Check your Chord- and/or Transposition Track(s).
Currently Being ModeratedOct 17, 2012 11:22 AM (in response to Eriksimon)
I don't see anything at all in the chord or transposition tracks (or any other global track, except see below).
I DO notice that the loudness of a note is a strong non-linear function of the velocity of the note (assigned in the piano roll), in the sense that when the velocity becomes greater than about 106 the loudness increases dramatically (and annoyingly), AND the bar representing that velocity in the hyper editor "all velocities" track turns white (from blue). Maybe this has something to do with it. (I may start a new thread with this observation).
Currently Being ModeratedOct 17, 2012 1:40 PM (in response to keystrike)
Sorry, turns out I didn't read your first post carefully enough. What you have in fact stumbled upon, may be unique to (the mapping of) whatever (sampled?) instrument you have chosen. Can you tell me which it is?
Most commonly loudness will indeed be a linear(-ish) function of velocity, but in some software instruments any value can be mapped to almost any other value in a variety of different ways, so without you naming specific instruments and/or presets your question is too much of a guessing game.
Currently Being ModeratedOct 17, 2012 2:16 PM (in response to Eriksimon)
You are probably right. My problem is with the string instruments which come with LogicPro - orchestral->strings->"cello section", "viola section", "violin section 01", "violin section 02". These are exs24 instruments. I've tried to find out where the problem might be, but have not had any success.
I think the two problems are different. In the case of the non-linear velocity response, I increase the velocity of the cello, note C2 say, using the mouse and velocity tool. As I slowly increase the velocity, the non-linearity (even in a fresh project) kicks in around velocity 113. When I then decrease the velocity, the non-linearity disappears around velocity 109 or 110, so there is a small hysteresis.
When the velocity is over this threshold threshold, there is also a significant "click" (or something) when the cello starts playing. For short notes, like 16ths, this "click" dominates the sound. Compare the loudness of three 16th notes of a cello playing C2 one after the other with velocities 100, 109 and 112 (Leave a little space between.). The 112 is almost twice as loud as the other two.
The same happens with the viola and violins. It's less of a problem for violins and violas are in the middle.
It would be wonderful if you could solve this problem, as it is very constraining. Thanks.
Currently Being ModeratedOct 17, 2012 2:46 PM (in response to keystrike)
Ah, yes, these are instruments with a combination of linear loudness-velocity response and socalled articulation layers. You can see this for yourself by using the Edit button on the EXS24, which brings you to the sample mappings. Simply put: to avoid (or alleviate) your issue, choose one of the presets with an articulation to their name (like Legato) as those may have a more consistent velocity response since they are not compounded from several different instruments.
In fact, all the EXS instruments you mention (Orch. Strings) are compound presets, the samples come from different other EXS Orch. Strings instruments. This serves the purpose of representing a "complete" bowed instrument in a single preset. Since you don't seem to care or know about these articulations, you're probably better off choosing the Legato variety of each. They probably still have some different velocity layers though. You can easily check this using the Edit button.
Of course, if you're feeling really adventurous you could try and edit the instruments to your liking. The EXS24 Edit window is reasonably self-explanatory.
http://documentation.apple.com/en/logicstudio/instruments/index.html#chapter=12% 26section=11%26hash=apple_ref:doc:uid:TempBookID-ReplacedWhenAssociatingWithMess ierRevision-43982EXS_SC_0908cp-1087225
Currently Being ModeratedOct 17, 2012 2:52 PM (in response to keystrike)
If you're using the velocity tool, you have to remember that some sounds change according to their velocity level - a different sample may be played above, say, a velocity value of 90, so that's usually a sample of the instrument playing harder and stronger and there's often a crossfade function so make them blend together better. The hysteresis occurs when notes have a velocity value near where that changeover of samples occurs (hysteresis usuallly means a ridiculously fast opening and closing of a gate to me, but I know what you mean).
You might find that the other things you mention are a different experience with other orchestral libraries - they're recorded differently and have a different sound, so you have to try stuff like that really, it is a totally subjective thing.
I've used Garageband instruments quite a few times for getting arrangements together and in some cases I have kept certain background parts from that, but finding the right sounds is a major part of what I do, so its just a continually ongoing situation.
Currently Being ModeratedOct 17, 2012 2:54 PM (in response to keystrike)
Thank you both very much. I will have to experiment.