Need help,
Is there any way I can screen record my iPad pro inc volume, without tethering to my i mac
Short answer: No - it's against Apple's App Store rules.
Long Answer: Even if you were to tether to the Mac (or PC), it would be difficult (or expensive) to get the sound as well. If you're willing to pay, Adobe Captivate will capture the screen, audio, and gestures (though it's a tethered solution).
What are you trying to capture? If it's an app demo (and you REALLY can't tether to a computer), you could always take Screen Caps, bring into iMovie and record narration.