John F
Try this;
Copy and paste to the new track, but paste with a slight offset, for example, instead of position 1:1:000, paste at 1:1:010.
You can experiment with offset amounts to taste.

Hope this is helpful.

Vintage

edit;
To further enhance the thickening, you can detune the doubled track by a couple of cents and/or add different level of reverb.

Last edited by VintageGibson; 07/12/21 10:56 PM. Reason: more info