Working on processors a tiny bit

src/lib/audio/processors/SpectralShift.ts

@@ -1,4 +1,4 @@
-import type { AudioProcessor } from './AudioProcessor';
+import type { AudioProcessor, ProcessorCategory } from './AudioProcessor';
 
 export class SpectralShift implements AudioProcessor {
   getName(): string {
@@ -9,6 +9,10 @@ export class SpectralShift implements AudioProcessor {
     return 'Shifts all frequencies by a fixed Hz amount creating inharmonic, metallic timbres';
   }
 
+  getCategory(): ProcessorCategory {
+    return 'Spectral';
+  }
+
   process(
     leftChannel: Float32Array,
     rightChannel: Float32Array