Thanks Don and Phil for the great answer. Some further comments: * I find interesting that you are getting better correlations when you add a well-known noise

Thanks Don and Phil for the great answer. Some further comments: * I find interesting that you are getting better correlations when you add a well-known noise burst instead of a less chaotic signal (e.g. a tone or a chirp). In retrospect, it makes sense * for the uplink/downlink breakup, I see in the Usage.md file in oboetester that you're isolating the downlink measurement with the tap-to-tone experiment. For this experiment, the doc suggests to use (a) the jack to avoid the speaker processing extra latency, and (b) a USB-MIDI input device to replace the touch screen latency (15-30 ms). 2 questions here: * Q1: I assume that, if instead of the jack, you use a usb-c audio adapter accessory mode, there should be no extra latency either, right? (I'm using late pixel phones) * Q2: which device are you using for the USB-MIDI input? Thanks again! edit: s/markdown/formatdoc/g