This is not a trivial question, and as a company that makes software specifically for the professional production of music, the copyright issue could perhaps be clearer. The place to look for clarification is in the EULA that accompanies the software.
For Sonar X3, for example the following is a pretty unambiguous statement included in the LICENSE AGREEMENT in the User Guide:
"3.2 The Licensee may modify the instrument content. LICENSEE MAY USE THE INSTRUMENT CONTENT FOR
COMMERCIAL PURPOSES WITHIN MUSICAL COMPOSITIONS." Unfortunately the same contract specifies that certain content distributed with X3 belongs to other parties, and a clear statement of how that third party content is licensed to the Sonar purchaser is ambiguous.
If the material is included in the term "demo content," the use would be severely limited:
"4. DEMO or THIRD PARTY DEMO CONTENT RESTRICTIONS. Unless specified elsewhere in your product package, the following restrictions apply to all digitally recorded sounds, MIDI or Cakewalk-format song files or
rhythm patterns, and printed or digitally reproduced sheet music contained in the product package (the "demo content"): All demo content is protected by copyright and owned by Cakewalk or other parties that have licensed these works to Cakewalk. Any duplication, adaptation, or arrangement of the demo content without written consent of the owner is an infringement of U.S. or foreign copyright law and subject to the penalties and liabilities provided therein. You may not synchronize the demo content with any videotape or film, or print the demo content in the form of standard music notation, without the express written permission of the copyright owner. The demo content may not be used for broadcast or transmission of any kind. You may not resell or redistribute the demo content "as is" 52 (i.e., stand alone) in any way, including for use in sampling or sample playback units, or in any sound library product, or in any radio or television broadcast, soundtrack, film or other commercial product in any media, whether the works remain in their original form or are reformatted, mixed, filtered, re-synthesized or otherwise edited."
Presumably samples and presets provided by Cakewalk are not "demo content," but would be considered "instrument content," and thus be licensed for use in your own music. How you would be able to determine if there is "third party" instrument content which has not been licensed to you is a puzzle for me.
I assume there is something like this hidden somewhere in the Z3Ta +2 download or installation material, although it may require an actual installation to reveal it.
I have searched in vain for a web accessible copy of the license for any Cakewalk product. Apparently you have to buy the product and then agree to the included EULA after purchase but before completing installation.