letting bass instrument playing only the lowest midi-note of chord played?

Your midi keyboard could probably be divided into two zones, and what you play in the lower zone could be directed to the bass instrument. (Sorry if you already know this.)

This isn't as fancy as what you apparently want (have the lowest current note being automatically detected and redirected in realtime), but it's going to be much easier to setup and much more reliable.

Anyone knows how to do this in Logic pro?

It can be done with programming in the Environment. Trouble is, it's going to be a lot of work (probably a lot more trouble than it's worth) to make it work reliably. This is because midi is inherently a serial protocol. That means that only one event happens at a time. So when you play a chord, and you think you're striking all the notes together, the notes are actually being played in a sequence. This means it's going to be inherently difficult for the program to determine what you mean by "the lowest note of the chord." If I'm playing a C major chord, and I strike the E a millisecond before I strike the C, how is the program supposed to know that the E should not be sent to the bass?

There are ways for a programmer do deal with such an issue (e.g., wait around for a moment to see if the player is going to strike another key), but dealing with issues like this in a reliable and satisfactory manner will take a lot of programming.

45rpm wrote:
It can be done with programming in the Environment.

Right, but when you offer such solutions it well be better to show a bit little of that, otherwise who will believe if this is possible and how to start, what to try etc 😀.

This means it's going to be inherently difficult for the program to determine what you mean by "the lowest note of the chord."

I have read such theories of some "Great Masters" about chord recognition, live input quantize or real time note pitch randomization which are unpredictable in the environment so according their theories it is not possible...
To my opinion Chord things are unpredictable like you guess though I could hack this creating the "Chord Translator" tool which behaves as the Kontakt Akkord Guitar script - i.e the tool can recognize the chord in any position, any octave and translate/recall a single note accord sample to use with EXS for example (the Logic factory 12strig accord guitar), so you can play musically chords like you do on your hardware style arranger synth and the Enviro tool will recall single accord samples (according your custom mapping in the tool menu) etc.
Another ever discussed themes are "Live Input Quantize" which which many experts say that is not possible, real time "Note Pitch" randomization which brings the problem with unpredictable Note OFFs messages causing note hanging ( I think I have provided a full working tool of that here ) etc.
So it will be better to try and give us some useful working info, prototypes or working schemes.

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when you offer such solutions it well be better to show a bit little of that, otherwise who will believe if this is possible

Are you saying it can't be done? I'll take your word for it.

"Chord things are unpredictable like you guess"

Ouch!
...
At least it was an educated guess.
🙂

45rpm wrote:
Are you saying it can't be done? I'll take your word for it.

I do say that it can or not be done cause I do not have time to try it out yet - this was the reason I preferred not to come into this topic giving any "empty" advices.
You came into the topic so it will be O.K if you provide some prototypes, schemes, advices how to do as I mentioned in my previous post, otherwise you will stay in your regular style of "Quick" posting or repeating of what the others said...

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your regular style of "Quick" posting

That reminds me. It's been about a week since I asked you some questions here. I suppose you want to avoid answering me with a " 'Quick' posting," but do you want to drop a hint regarding when your answer might be ready? Then again, maybe your statement that I questioned was just a " 'Quick' posting" and you're not too interested in explaining it.

45rpm wrote:

your regular style of "Quick" posting

Right, you came out too much off-topic there and I do not love off topic styles.
If you are interested what apps use the Pro Sample producing companies you may post in other forums, do a search etc - in any case it is not Logic...
And it will be nice if you continue this topic with the Environment project you started, not to post off-topic links...

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you came out too much off-topic there

Uh, no. Asking you to explain your recommendation was not off-topic there. Your recommendation there was mysterious, but it wasn't off-topic, and neither was asking you to explain it. And mentioning this here isn't off-topic here, either, since you raised the subject of those whose style is to make a " 'Quick' posting." In the absence of an explanation, that seems like an apt description for your mysterious recommendation. But maybe you have a good reason for it, so I'm hoping you'll finally privilege us with an explanation. Not here, of course, but rather in the thread where you made your mysterious recommendation.

FYI The best sample developing tool including by far the best loop utilities is Redmatica's Keymap Pro, and yes, all of the clued up sample instrument developers are using it...

...and it's insanely brilliant too...

Wave editor's are useful, but are in general way too tedious for building multisampled instruments, which can contain hundreds of thousands of individual files.

Yes, Keymap Pro is pretty amazing. And it definitely has a key feature which is present in the Logic Sample Editor and lacking in Wavelab, which is the ability to locate transients. It's the absence of this feature in Wavelab which makes the Wavelab recommendation mysterious to me.

What all this has to do with the fairly straightforward question of whether it's possible to give a MIDI input lowest-note priority and route that to another instrument in real time is beyond me.

I'm interested in your opinion. Is it possible? And is deciding whether or not it's possible a fairly straightforward question?

For an ostensibly straightforward question there have been a surprisingly low number of straightforward answers.

spheric wrote:
What all this has to do with the fairly straightforward question of whether it's possible to give a MIDI input lowest-note priority and route that to another instrument in real time is beyond me.

It hasn't. It is about Vacheto thinking he owns the place - and the environment.