first of all huge thanks for your great toolbox!
I wonder if it would be possible to add a second heart rate.
I train with a Garmin Fenix7 and usually use the wrist heart rate, which is fine for normal runs. Especially for intervals or hill training I also use a Polar H10 cheast heart rate monitor. I could just couple it with the Fenix and would get that heart rate - however, I´m interested in the comparison of both and sometimes the chest strap gives funny heart rates on other occasions the wrist-based is far off. The great thing about the Polar H10 is, that you can record the heart rate for one run without any additional device - so I get both, but in different files.
For a couple of runs, I combined the files with your tools and exchanged the Garmin heart rate with the polar heart rate measurements - resulting in one tcx file with the original Garmin heart rate measurements and one with the polar measurements. Those two files can be compared e.g. http://www.mygpsfiles.com/app/
green - Gramin Fenix7 wrist heart rate
It would be more convenient to have the second heart rate in the same file, with could then be uploaded to e.g. Garmin Connect and differences could be shown like other overlays (e.g. Herat rate and pace).
I´m not sure if one could "simply" define a new stream heart rate two ... but I also thought about simply placing it in another (unused or not interesting existing field (e.g. cadence - is not very useful for running especially intervals on a track).
My knowledge is far from being able to judge, how much work this would be, and I´m aware that this use case is not very frequent.
Best
Winfried
