Hello!
I have experienced issues with CPU-spikes and found a way to solve this on my computer. I just wanted to tell it here in case it can be a solution to others who have the same issue. I use Windows 10 and have experienced this both in SO3 and SO4:
When I play back a song which causes CPU spikes and open Windows resource monitor, I can see CPU 0 running on 90% load while CPU 1,2 and 3 are barely loaded. I have no idea why, but for some reason turning off fast startup in Windows solves this. The CPU load is now spread even between the cores without uncontrolled spikes. But every time Windows upgrades itself it switches fast startup back on. And every time this happens I have forgotten how to solve it and start troubleshooting from scratch

Thanks. Haven't got time to test this out at the moment, but for anyone else wanting to try this, here's a howto:
https://www.windowscentral.com/how-disa .. st-startup

Garry Knight
Studio One 3 Professional
Melodyne Editor 4, NI Komplete 11
Focusrite Scarlett 2i4 audio interface
Windows 10 Professional 64-bit, 16 GB RAM, Core i5
Microsoft Surface Pro 3, Core i7, 8GB RAM, 128 GB SSD
Nektar Impact LX49+, Samson Graphite 25, and Korg microKey 25 MIDI controllers
Novation ZeRO SL MkII mixing control surface
Korg nanoKontrol 2 mixing control surface
Reaper, Logic Pro X, GarageBand
https://soundcloud.com/garryknight

This also seems to work for me. I was out and about with my Surface Pro laptop today and noticed that it was spiking a fair bit. So I disabled fast startup then shut down and started up again. And, so far, no more spikes. But I'll be keeping an eye on it.

Garry Knight
Studio One 3 Professional
Melodyne Editor 4, NI Komplete 11
Focusrite Scarlett 2i4 audio interface
Windows 10 Professional 64-bit, 16 GB RAM, Core i5
Microsoft Surface Pro 3, Core i7, 8GB RAM, 128 GB SSD
Nektar Impact LX49+, Samson Graphite 25, and Korg microKey 25 MIDI controllers
Novation ZeRO SL MkII mixing control surface
Korg nanoKontrol 2 mixing control surface
Reaper, Logic Pro X, GarageBand
https://soundcloud.com/garryknight

What would be a similar workaround for mac OS X?

Studio One 4.1 - Mac-pro 2009 - 3.33 12cores 32gb ram, osx 10.12.6, UAD 2 octo(x2) - quad (x1) - RME FIREFACE 802

this actually works.
drops about 5% CPU.
nice.

Intel i7-7820x, 128gb RAM, 4tb m.2, GTX 1080ti
Windows 10 Pro
Audient id14
PreSonus Studio One Pro v4
Reaper, Fruityloops

frederichodshon1 wrotethis actually works.
drops about 5% CPU.
nice.

Glad to hear that! In my case, this is actually something I need to do to be able to use synths at all. Without this switched off I can have cpu-spikes and crackling sound after loading just one single synth.

I never had issues with this on, however I have already disabled this setting due to a Windows 10 bug that introduced itself in the Anniversary update a while back. Perhaps this has contributed to my system being pretty stable and CPU efficient with S1.
Thanks for reporting.

Some tips on disabling fast startup: https://www.tenforums.com/tutorials/418 .. -10-a.html
If you disable hibernate, that will automatically disable fast startup, since they are related: https://www.tenforums.com/tutorials/285 .. -10-a.html
Hope this helps..

DAWs: Studio One Pro v4.6.1, and others .. OS: Win10 Pro x64 1909 System: Home-built custom PC; i3 3.4Ghz; 16GB DDR3; Intel HD Graphics; Dual Monitors; Samsung EVO 850 SSD, 250GB; WD 1.0TB 7200rpm; PCIe FireWire Audio: M-Audio FW-410

One thing that helped me was to go to 'device manager' -> 'universal Serial Bus Controllers' -> 'USB Root Hub / Generic Root Hub' etc -> right click 'properties' -> 'Power Management' -> UNCHECK 'Allow the computer to turn off this device to save power'. I am on a windows laptop, so might be different for a desktop pc.
Another thing you could do is to close all 'unnecessary' programs except Studio One, reopen the programs until the performance spikes appear again. I did undervolt my laptop and after turning off MSI Afterburner and Throttle Stop the performance spikes disappeared, no problems since then. Hope that helps.

I've just got a PreSonus AudioBox iOne that I want to use to hook up my electric guitar to record on Garageband on my MacBook Pro.
The AudioBox is hooked up to the USB port. All lights are on.
In MacBook Preferences, the AudioBox is selected as the sound input and output device. When I strum my guitar, it registers audio levels.
In Garageband Preferences, the AudioBox is selected as the sound input and output device.
I hit record on Garageband. I can hear my guitar through the headphones hooked into the AudioBox.
Garageband doesn't seem to be getting any sound from the AudioBox, whether or not record is on. There is no response, no sound levels, either during recording or during playback.
The little slider on the 'Clean Combo' Guitar track is turned all the way to the right. I've tried pressing and undressing the mute/unmute button.
The little slider to the left of the metronome at the bottom of Garageband is all the way to the right.
Help! What am I missing?
Hardware — MacBook Pro / PreSonus AudioBox iOne
System — Mac OSX Yosemite 10.10.3
Software — Garageband '11 6.0.5

My sysyem consist if an iTwo with a Mac Pro. My setup for GarageBand is as follows:
1. While strumming the guitar I adjust the gain knob on the instrument input on the AudioBox until I
get green with no red.
2. In System Preferences, I have the iTwo AudioBox selected for Audio in and out.
3. In Garageband Audio Preferences, I have System settings for Audio in and out.
4. I Choose New Track from GarageBand Menu
5. I Choose Record Guitar or Bass Amp using Garageband as Amp
6. Select the Details button and choose the correct input channel (Input 2)
7. Adjust the audio levels on the track to desired levels.
8. Choose the track hit record.

Your No. 4 is the key!
I took it to the guitar store and it took them an hour to figure it out.
The thing is, you'll never see that dialogue box if you use the 'guitar' track that GarageBand automatically creates when you create a new project. This is the trick: YOU HAVE TO CREATE A NEW TRACK in order to be able to select Channel 2.
Create the track, choose 'Electric Guitar,' then click the triangle next to 'Instrument Setup' then use the dropdown menu to choose mono Ch. 2.
Whew!
Thanks