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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:

I updated my MacMini (end 2012 with internal 750Gb SSD) to OS X 10.9.1. I am using a Line6 UX2 with drivers 7.3.6 (Monkey : 1.65) I ma using Logic X (last version) And I have big crackling and popping issues when I try to record my guitar or bass (on both instrument inputs). I tried to make a bigger buffer in the system prefs and/or Logic X, but it changes nothing. Impossible to have a "clean" recording without a periodic crackling noise (periodicity depending on the buffer size, from aprox 0.3 to 1 second space) The only way to get it clean again is : 1/ to deactivate "core audio" in Logic X. But then I loose all the cool guitar and bass effects... and that's (partly) why I bought Logic in the first place !! 2/ I plug my little Apogee Jam (which I bought for my iPad) and there i gat Logic Audio working perfectly !! But I bought mu Line6 UX2 to use it !!! So please people : fix the UX2 drivers for Maverick !! Or tell me what's wrong with my UX2 ? .. In the meantime, I've lost too much time trying to fix Line 6 core audio problems ! If you can't make drivers for the mac, just say it !! I'm selling my line 6 junck and switching to MOTU ! They have a REAL customer support for Mac OS and CARE about us !!

Hi I updated my MacMini (end 2012 with internal 750Gb SSD) to OS X 10.9.1. I am using a Line6 UX2 with drivers 7.3.6 (Monkey : 1.65) I ma using Logic X (last version) And I have big crackling and popping issues when I try to record my guitar or bass (on both instrument inputs). I tried to make a bigger buffer in the system prefs and/or Logic X, but it changes nothing. Impossible to have a "clean" recording without a periodic crackling noise (periodicity depending on the buffer size, from aprox 0.3 to 1 second space) The only way to get it clean again is : 1/ to deactivate "core audio" in Logic X. But then I loose all the cool guitar and bass effects... and that's (partly) why I bought Logic in the first place !! 2/ I plug my little Apogee Jam (which I bought for my iPad) and there i gat Logic Audio working perfectly !! But I bought mu Line6 UX2 to use it !!! So please people : fix the UX2 drivers for Maverick !! Or tell me what's wrong with my UX2 ? I provide a sample of the sound. Guitare crackling.wav