This came out of a question in the electronics forum, but might be useful to people in here too. For example if you have a single sided power meter and a known leg imbalance. It will update all of the power values in all the TCX files in a folder, by a percentage you specify. It saves a copy of the original file immediately before writing in case anything goes wrong or you change your mind. It is quick and dirty, but does the job.
https://github.com/CascadePass/TCXPo...eases/tag/v1.0