4/7/2023 0 Comments Quod libet mac reviewThe headphone output plays back channels 1/2, which are also the monitor channels.Line out channels 3/4 are fixed volume and there's no monitoring out of them, i.e.The input monitor mix potentiometer is only in use when there's something to monitor.Turning on monitoring for an input channel has no impact on the sound quality of the channel.Some things I've noticed during use and measuring I think are worth mentioning: Already simply the cost of the high-quality chips inside the M4 is considerable, even if the M4 itself is considered affordable. Possibility for a digital input, anyone? The preamp chips are stereo, so for a 4-channel model there must be multiple of those. Not sure if there are 2 unused channels or if they are used somehow internally. The M4 has four output channels and I guess two more channels are used for the headphone output. For rest of the M4 specs, see the official Motu site. For example, the ESS DAC has a THD+N of -110 dB and the AKM ADC -106 dB respectively. ADC: AKM AK5554VN ( AKM AK5552VN for M2).Here are some specifications I haven't found anywhere else online, but which I've checked from the manufacturer: All the knobs feel really nice and sturdy. This review is more about the outputs and Linux compatibility. In this review I skip microphone recording tests, as there are already many review videos on YouTube addressing that specific area. It took quite a few weeks for the device to arrive, as apparently it's been hugely popular. I wanted a device that is class-compliant and bus-powered, and the M4 fit the bill nicely. They seemed to offer superb sound quality in a nice package. Motu had just released the M2 and M4 USB audio interfaces in November. As new motherboards don't have a PCI bus anymore, I had to give up my ESI and look for a replacement. I updated my computer at the end of year 2019. Motu M4 review With measurements and Linux notes In principle you can achieve the same thing with the AppKit APIs too, but then your Python application is treated as a Mac Application (visible in the Dock with an icon and everything), while I wanted this to be kept in the background altogether.Add Ubuntu 20.04.1 LTS and RT audio info some tidying up.Īdd note about fixed duplex sound support.Īdd note about systemd and realtime audio.Īdd more Linux compatibility tests and notes.Īdd note about switching the sample rate. I converted the Quartz event into a NSEvent, because all the information I could find on Mac multimedia keys was referring to that class. KeyEvent = NSEvent.eventWithCGEvent_(event) # Convert the Quartz CGEvent into something more useful The callback should have the following signature (it implements the CGEventTapCallBack method from the Quartz API: def keyboardTapCallback(proxy, type_, event, refcon): Quartz.CGEventMaskBit(Quartz.kCGEventKeyUp) for key up events. I defined a tap for system defined keys only (media keys) you'll have to specify a different event mask ( CGEventMaskBit with one or more Event Types) e.g. # and run! This won't return until we exit or are terminated. RunLoopSource = Quartz.CFMachPortCreateRunLoopSource(None, tap, 0) Quartz.CGEventMaskBit(NSSystemDefined), # NSSystemDefined for media keys Quartz.kCGEventTapOptionListenOnly, # Listening is enough Quartz.kCGHeadInsertEventTap, # Insert wherever, we do not filter Quartz.kCGSessionEventTap, # Session level is enough for our needs # Set up a tap, with type of tap, location, options and event mask The following code registers a python callback which is passed global key presses, and starts the event loop: import Quartzįrom AppKit import NSKeyUp, NSSystemDefined, NSEvent I used the Quartz CGEventTapCreate hook and event loop, and the Cocoa AppKit framework to decipher key codes to achieve this. I recently coded up an extension to quodlibet capturing multimedia keys (since absorbed into quodlibet itself) for your setup the same process applies.
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