Endless console warning spam

[hardsmoke]

System Information
Please provide the following information about your system:

• Steam Audio version: 4.7.0, but SteamAudio.cs from repository (without it crash)
• (If applicable) Unity version: 6000.0.25f1
• (If applicable) Unreal Engine version:
• (If applicable) FMOD Studio version: 2.03.08
• Operating System and version: windows
• (Optional) CPU architecture (e.g. x86-64, armv7): x64

Issue Description
Spams a lot of warnings in the console. Installed a new SteamAudio.cs because without it it was crashing (#464). Is this how it should be?

Steps To Reproduce
Steps to reproduce the behavior:

1. Enable "EnableValidation" setting in SteamAudioSettings
2. Start playmode with steam audio sources on scene