I have a completed song that I wish to remix by adding some commercial loops to the arrangement (Such as you can buy from Producer Loops, etc.)
 
Many of the loops you can buy specify that they will adapt to key and tempo.  But I want them to adapt to the existing chord progressions in the song.  I think this cannot be done with audio loops, but I wonder if it can be done with MIDI loops, and how difficult that might be.
 
Am I correct regarding using MIDI loops?  Are there any existing tutorials showing this procedure?
 
Thanks, Don

If your song was recorded to a BPM than it should be very easy to do.
I would use Session drummer 3 or Additive drummer, exc, than build the beats in the Piano Roll View.
This can be achieved by drawing in your notes for the midi track/soft synth of choice.

I believe acidized loops will respond to key change markers un song.

dubdisciple
I believe acidized loops will respond to key change markers un song.

Thanks for response, but that is one of the problems I have with terminology.  I don't want to change KEY; if the song is written in the key of C, I want to keep it there.  What I want is the ability to change the chords within that key so they will match my chord sequences.
 
I am not sure if the phrase "key change markers" is used for convenience as another way of saying the same thing???
 

Having the the loop respond to key changes, i believe would change the chords since sound would shift entire sound to adjust to change...at least that is my guess. Personally i never tried that. I would manually cut the part of the chord i wanted to change and shift it manually and bounce to new file

It is "pitch markers" that change the pitch of groove clips. Pitched groove clips should contain a value for the reference note, which should match the pitch you hear just playing the clip outside the DAW. Setting a pitch marker to a different pitch causes Sonar to play the clip at the new pitch. Problems could arise because 1) the clip's native pitch is too far from the pitch you try to change it to, so it sounds lousy, and 2) sometimes just shifting the pitch does not match the chord changes or harmony you're after.

bvideo.......That pretty well states some of the problems involved.  Which is why I asked the question about MIDI loops.
 
I am under the impression that music in MIDI form can be changed according to your own specifications, which you cannot do with audio loops in the same way.
 
So back to my original question:  Am I correct that I would be able to have MIDI loops changed without problems so as to correlate with my chord progressions?  (I think this is a different question than trying to use Sonar's Groove Clips.)

Well not 100% sure what you are asking, but if you add/write midi parts (they don't have to be loops), you can change individual notes, chords, velocities and w.e. you like. Midi is usually used to control a synthesizer which outputs the audio, Midi doesn't output any audio in itself. Midi contains information for a synthesizer to play the notes you want it to play. You can put the existing song on one track and add stuff on other tracks and mix them with your hearts content.

I will post my original comment again,
""This can be achieved by drawing in your notes for the midi track/soft synth of choice in the PRV""
 
Drawing/editing notes by hand in the PRV will allow you to cut, copy, paste, change keys, velocity's, exc.

chuckebaby
""This can be achieved by drawing in your notes for the midi track/soft synth of choice in the PRV""  Drawing/editing notes by hand in the PRV will allow you to cut, copy, paste, change keys, velocity's, exc.

Chuck, thanks for the response.  I was hoping, however, to be able to make the changes by chords rather than by attacking each individual note.  I found this answer to my exact same question in the Logic Pro forum:
 
"IF the loop is a Software Instrument, i.e. MIDI track, with the track editor open in either Score or Piano Roll format, you could highlight all the notes in the loop, starting where you want the chord change, and transpose-by-dragging the notes (which will all move as a group) up or down to the desired beginning note."
 
Could it be done the same way in Sonar, grabbing groups of notes and moving them up or down?