diff --git a/src/cwtest/cfg/flow_proc_dict.cfg b/src/cwtest/cfg/flow_proc_dict.cfg
index a967e83..3cdc584 100644
--- a/src/cwtest/cfg/flow_proc_dict.cfg
+++ b/src/cwtest/cfg/flow_proc_dict.cfg
@@ -18,7 +18,7 @@
       audio_out: {
         vars: {
           dev_label: { type:string,            doc:"Audio device label." },
-          in:        { type:audio, srcFl:true, doc:"Audio input." }
+          in:        { type:audio, flags:["src"], doc:"Audio input." }
           }
       }
       
@@ -34,13 +34,13 @@
         vars: {
           fname: { type:string,            doc:"Audio file name." },
 	  bits:  { type:uint, value:32,    doc:"Audio file word width. (8,16,24,32,0=float32)."},
-          in:    { type:audio, srcFl:true, doc:"Audio file input." }
+          in:    { type:audio, flags:["src"], doc:"Audio file input." }
           }
       }
 
       audio_gain: {
         vars: {
-	   in:   { type:audio, srcFl:true, doc:"Audio input." },
+	   in:   { type:audio, flags:["src"], doc:"Audio input." },
 	   gain: { type:real, value:1.0, doc:"Gain coefficient." }
 	   out:  { type:audio,             doc:"Audio output." },
         }
@@ -48,7 +48,7 @@
 
       audio_split: {
          vars: {
-	   in:     { type:audio, srcFl:true, doc:"Audio input." },
+	   in:     { type:audio, flags:["src"], doc:"Audio input." },
 	   select: { type:bool,              doc:"Enable/Disable each channel" }
 	   gain:   { type:real, value:1.0,   doc:"Audio gain for each selected (output) channel." }
 	   out:    { type:audio,             doc:"Audio output." },
@@ -63,7 +63,7 @@
 
       audio_duplicate: {
          vars: {
-	   in:        { type:audio, srcFl:true, doc:"Audio input."},
+	   in:        { type:audio, flags:["src"], doc:"Audio input."},
 	   duplicate: { type: uint,            doc:"Count of times to repeat this channel." },
 	   gain:      { type: real, value:1.0, doc:"Audio gain." },
 	   out:       { type:audio,             doc:"Audio output containing repeat * input channel count channels."}
@@ -72,14 +72,14 @@
 
       audio_merge: {
          vars: {
-	   in0:  { type:audio, srcFl:true, doc:"First audio input." },
-	   in1:  { type:audio, srcFl:true, doc:"Second audio input." },
-	   in2:  { type:audio, srcFl:true, srcOptFl:true, doc:"Third audio input." },
-	   in3:  { type:audio, srcFl:true, srcOptFl:true, doc:"Fourth audio input." },
-	   in4:  { type:audio, srcFl:true, srcOptFl:true, doc:"Fifth audio input." },
-	   in5:  { type:audio, srcFl:true, srcOptFl:true, doc:"Sixth audio input." },
-	   in6:  { type:audio, srcFl:true, srcOptFl:true, doc:"Seventh audio input." },
-	   in7:  { type:audio, srcFl:true, srcOptFl:true, doc:"Eigth audio input." },
+	   in0:  { type:audio, flags:["src"],            doc:"First audio input." },
+	   in1:  { type:audio, flags:["src"],            doc:"Second audio input." },
+	   in2:  { type:audio, flags:["src","src_opt"],  doc:"Third audio input." },
+	   in3:  { type:audio, flags:["src","src_opt"],  doc:"Fourth audio input." },
+	   in4:  { type:audio, flags:["src","src_opt"],  doc:"Fifth audio input." },
+	   in5:  { type:audio, flags:["src","src_opt"],  doc:"Sixth audio input." },
+	   in6:  { type:audio, flags:["src","src_opt"],  doc:"Seventh audio input." },
+	   in7:  { type:audio, flags:["src","src_opt"],  doc:"Eigth audio input." },
 	   gain: { type:real, value:1.0, doc:"Audio gain for each selected (output) channel." }
 	   out:  { type:audio,             doc:"Audio output. Channel count is the sum of the input channel count." },
 	 }
@@ -87,8 +87,8 @@
 
       audio_mix: {
          vars: {
-	   in0:   { type:audio, srcFl:true, doc:"First audio input." },
-	   in1:   { type:audio, srcFl:true, doc:"Second audio input." },
+	   in0:   { type:audio, flags:["src"], doc:"First audio input." },
+	   in1:   { type:audio, flags:["src"], doc:"Second audio input." },
 	   gain0: { type:real, value:0.5,   doc:"Audio gain for input 0." },
 	   gain1: { type:real, value:0.5,   doc:"Audio gain for input 1." },
 	   out:   { type:audio,             doc:"Audio output. Channel count is the sum of the input channel count." },
@@ -97,7 +97,7 @@
 
       audio_delay: {
         vars: {
-	   in:         { type:audio, srcFl:true,   doc:"Audio input." },
+	   in:         { type:audio, flags:["src"],   doc:"Audio input." },
 	   maxDelayMs: { type:real, value:1000.0   doc:"Maximum possible delay in milliseconds." },
 	   delayMs:    { type:real,                doc:"Delay in milliseconds." },
 	   out:        { type:audio,               doc:"Audio output." },
@@ -122,7 +122,7 @@
 
       pv_analysis: {
         vars: {
-          in:		{ type:audio,    srcFl:true,   doc:"Audio input." },
+          in:		{ type:audio,    flags:["src"],   doc:"Audio input." },
 	  maxWndSmpN:	{ type:uint,     value:  512,  doc:"Maximum window sample count." },
           wndSmpN:	{ type:uint,     value:  512,  doc:"Window sample count." },
           hopSmpN:	{ type:uint,     value:  128,  doc:"Hop sample count." },
@@ -206,14 +206,14 @@
 
       pv_synthesis: {
         vars: {
-          in:  { type:spectrum,  srcFl:true,  doc:"Spectrum input." },
+          in:  { type:spectrum,  flags:["src"],  doc:"Spectrum input." },
           out: { type:audio,                  doc:"Audio output." }
           }
       }
 
       spec_dist: {
         vars: {
-          in:       { type:spectrum, srcFl:true, doc:"Spectrum input." },
+          in:       { type:spectrum, flags:["src"], doc:"Spectrum input." },
 
 	  bypass:   { type:bool, value: false, doc:"Copy input to output without transform."},
           ceiling:  { type:real, value: 30.0, doc:"Ceiling parameter."},