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This is my elaboration on Round Trip Latency of Helix hardware used as audio interface based on research on closed fb group https://www.facebook.com/photo.php?fbid=10156514192780269&set=pcb.1077888115728194&type=3&theater&ifg=1 This topic is hardly relevant if you are monitoring direct. Helix hardware latency is 1,8ms from AD/DSP/DA (measured for one DSP Path), no matter what buffer or sampling frequency you pick. If you use another interface for monitoring/recording it is not relevant neither. It is 2,70 firmware time. OSX - you have a choice of two drivers: 1. Multi sampling rate Core Audio driver. You get the lowest latency of 15ms using 32 samples buffer but this seems not to be stable (tested on 8th gen i7) . Safer buffers of 64, 128 samples are at 20ms range. 2. Class Compliant 48kHz driver at 64 samples buffer gives 8ms RTL. EDIT: I do not know if 8ms RTL is REPORTED by the driver or it can be REAL RTL. Windows - you have a choice of two drivers: 1. Supplied ASIO driver. Here are my figures for Round Trip Latencies: 21ms on "Small" 128 samples buffer@48kHz 17ms on "Extra Small" 64 samples buffer@48kHz 15ms on "Small" 128 samples buffer@96kHz 10ms on "Extra Small" 64 samples buffer@96kHz - but this setting is unusable because of artifacts. Bad news for virtual instruments players are 3/4 of RTL is on the output side. 2. ASIO4ALL driver - it is rather overlay for WDM driver, not compatible with Pro Tools. Round Trip Latencies are: 5ms at 128 samples buffer@48kHz 3ms at 64 samples buffer@48kHz 3ms at 128 samples buffer@96kHz Good news or virtual instruments players are buffers are 50/50 input/output. EDIT: I have proven that they are in fact REPORTED RTLs. They are fake numbers! I made my Windows tests using using Reaper (64bit), desktop Windows 10 PC with 3th gen i5 CPU, 16GB RAM. Reaper session was loaded with 5 Hx Native instances. CPU usage was monitored with Windows Task Manager and for the same 128 buffers on both drivers was at 30%. 7ms pictured vs mine 5ms is because I switched off additional 32 samples buffers used for latency compensation in ASIO4ALL (for aggregating devices?) Some pictures to back it up: