adds some comments about the parameters diffwave uses

src/diffwave/params.py

@@ -66,14 +66,14 @@ params = AttrDict(
 
     # Data params
     sample_rate=22050,
-    n_mels=80,
+    n_mels=80, # this is actually not used for unconditional generation
     n_fft=1024,
     hop_samples=256,
     crop_mel_frames=62,  # Probably an error in paper.
 
     # Model params
     residual_layers=30,
-    residual_channels=64,
+    residual_channels=64, # 64 or 128 for a larger model (diffwave large)
     dilation_cycle_length=10,
     unconditional = False,
     noise_schedule=np.linspace(1e-4, 0.05, 50).tolist(),