diff --git a/src/graphBuilder.ts b/src/graphBuilder.ts
index 8d01f7c..fbf72e6 100644
--- a/src/graphBuilder.ts
+++ b/src/graphBuilder.ts
@@ -80,7 +80,7 @@ export function buildGraph(vfNodes: Node[], vfEdges: Edge[]): GraphJson {
       format = {
         kind,
         sample_rate:   Number(srcData?.params.sample_rate   ?? 48000),
-        channels:       Number(srcData?.params.channels       ?? 2),
+        channels:       Number(srcData?.params.channels) || 2,
         bit_depth:      32,
       }
     }
diff --git a/src/nodeTypes.ts b/src/nodeTypes.ts
index 604f168..24c6428 100644
--- a/src/nodeTypes.ts
+++ b/src/nodeTypes.ts
@@ -58,9 +58,8 @@ export const FORMAT_OPTIONS_VIDEO: ParamDef[] = [
 ]
 
 export const FORMAT_OPTIONS_AUDIO: ParamDef[] = [
-  { key: 'channels',    label: 'Channels',    type: 'number', default: 0, min: 0, max: 16, group: 'AUDIO' },
+  { key: 'channels',    label: 'Channels',    type: 'number', default: 2, min: 1, max: 16, group: 'AUDIO' },
   { key: 'sample_rate', label: 'Sample Rate', type: 'select', options: SAMPLE_RATE_OPTIONS, default: 48000, isFormat: true, group: 'AUDIO' },
-  { key: 'amplitude_db', label: 'Amplitude (dBFS)', type: 'number', default: -18, min: -60, max: 0 },
 ]
 
 export const NODE_TYPES: Record<string, NodeTypeDef> = {
@@ -74,7 +73,8 @@ export const NODE_TYPES: Record<string, NodeTypeDef> = {
     params: [
       ...FORMAT_OPTIONS_VIDEO,
       ...FORMAT_OPTIONS_AUDIO,
-      { key: 'pattern', 'label': 'Pattern', type: 'select', options: PATTERN_OPTIONS, default: 'bars' },
+      { key: 'amplitude_db', label: 'Amplitude (dBFS)', type: 'number', default: -18, min: -60, max: 0, group: 'AUDIO' },
+      { key: 'pattern', label: 'Pattern', type: 'select', options: PATTERN_OPTIONS, default: 'bars' },
     ],
   },
   ndiin: {
@@ -86,7 +86,6 @@ export const NODE_TYPES: Record<string, NodeTypeDef> = {
     ],
     params: [
       { key: 'source_num', label: 'NDI Source #', type: 'number', default: 0, min: 0, max: 15 },
-      ...FORMAT_OPTIONS_VIDEO,
       ...FORMAT_OPTIONS_AUDIO,
     ],
   },
@@ -99,8 +98,7 @@ export const NODE_TYPES: Record<string, NodeTypeDef> = {
     ],
     params: [
       { key: 'device_index', label: 'Port', type: 'select', options: DEVICE_OPTIONS, default: 0 },
-      ...FORMAT_OPTIONS_VIDEO,
-      ...FORMAT_OPTIONS_AUDIO,
+      { key: 'channels', label: 'Channels', type: 'number', default: 2, min: 1, max: 16, group: 'AUDIO' },
     ],
   },
   ndiout: {