Did I implement Schroeder reverb correctly? C#

I am working on a Schroeder reverb in Unity3D for a school assignment.

I used this picture as a basis...

... and created this script.

You can download the Unity3D project here.

I have used the OnAudioFilterRead() method, which allows the editing of audio through the manipulation of the array data[], which contains audio information. Within the OnAudioFilterRead() method I apply the Schroeder algorithm, which is: 4 x comb filter parallel, 2 x all pass in series.

My questions:

• Did I implement it correctly?

• Are there things in my code that can be improved?

• I'm having a hard time getting it to sound "good". Is this inherent to the algorithm, or did I fuck up somewhere?

Thanks for your time & merry Christmas! :]