diff --git a/revid/audio-input.go b/revid/audio-input.go
index 4b498926..bf3980e7 100644
--- a/revid/audio-input.go
+++ b/revid/audio-input.go
@@ -197,16 +197,16 @@ func (a *AudioInput) open() error {
 		log.Log(logger.Debug, "Sample rate set", "rate", defaultSampleRate)
 	}
 
-	var fmt alsa.FormatType
+	var aFmt alsa.FormatType
 	switch a.BitDepth {
 	case 16:
-		fmt = alsa.S16_LE
+		aFmt = alsa.S16_LE
 	case 32:
-		fmt = alsa.S32_LE
+		aFmt = alsa.S32_LE
 	default:
-		return errors.New("Unsupported sample bits")
+		return fmt.Errorf("Unsupported sample bits %v\n", a.BitDepth)
 	}
-	_, err = a.dev.NegotiateFormat(fmt)
+	_, err = a.dev.NegotiateFormat(aFmt)
 	if err != nil {
 		return err
 	}
@@ -274,7 +274,6 @@ func (a *AudioInput) input() {
 // Read reads a full PCM chunk from the ringbuffer, returning the number of bytes read upon success.
 // Any errors returned are unexpected and should be considered fatal.
 func (a *AudioInput) Read(p []byte) (n int, err error) {
-	fmt.Println("Performing AudioInput read...")
 	chunk, err := a.rb.Next(rbNextTimeout)
 	switch err {
 	case nil:
diff --git a/revid/audio-input_test.go b/revid/audio-input_test.go
index a510428b..7c817c5f 100644
--- a/revid/audio-input_test.go
+++ b/revid/audio-input_test.go
@@ -2,28 +2,28 @@ package revid
 
 import (
 	"testing"
+
+	"bitbucket.org/ausocean/iot/pi/netsender"
 )
 
-func TestAudioInput(t *testing.T) {
+func TestAudioInputStart(t *testing.T) {
+	var logger testLogger
+	ns, err := netsender.New(&logger, nil, nil, nil)
+	if err != nil {
+		t.Errorf("netsender.New failed with error %v", err)
+	}
 
-	// var logger testLogger
-	// ns, err := netsender.New(&logger, nil, nil, nil)
-	// if err != nil {
-	// 	t.Errorf("netsender.New failed with error %v", err)
-	// }
+	var c Config
+	c.Logger = &logger
+	c.Input = Audio
 
-	// var c Config
-	// c.Logger = &logger
-	// c.Input = Audio
-	// c.Outputs = make([]uint8, 1)
+	rv, err := New(c, ns)
+	if err != nil {
+		t.Errorf("revid.New failed with error %v", err)
+	}
 
-	// rv, err := New(c, ns)
-	// if err != nil {
-	// 	t.Errorf("revid.New failed with error %v", err)
-	// }
-
-	// err = rv.Start()
-	// if err != nil {
-	// 	t.Errorf("revid.Start failed with error %v", err)
-	// }
+	err = rv.Start()
+	if err != nil {
+		t.Errorf("revid.Start failed with error %v", err)
+	}
 }
diff --git a/revid/config.go b/revid/config.go
index 7bebf599..d914e221 100644
--- a/revid/config.go
+++ b/revid/config.go
@@ -164,10 +164,11 @@ const (
 	defaultExposure           = "auto"
 	defaultAutoWhiteBalance   = "auto"
 
-	defaultSampleRate = 48000
-	defaultBitDepth   = 16
-	defaultChannels   = 1
-	defaultRecPeriod  = 1
+	defaultAudioInputCodec = ADPCM
+	defaultSampleRate      = 48000
+	defaultBitDepth        = 16
+	defaultChannels        = 1
+	defaultRecPeriod       = 1
 )
 
 // Validate checks for any errors in the config fields and defaults settings
@@ -211,10 +212,16 @@ func (c *Config) Validate(r *Revid) error {
 		}
 	case PCM, ADPCM:
 	case NothingDefined:
-		c.Logger.Log(logger.Info, pkg+"no input codec defined, defaulting", "inputCodec", defaultInputCodec)
-		c.InputCodec = defaultInputCodec
-		c.Logger.Log(logger.Info, pkg+"defaulting quantization", "quantization", defaultQuantization)
-		c.Quantization = defaultQuantization
+		switch c.Input {
+		case Audio:
+			c.Logger.Log(logger.Info, pkg+"input is audio but no codec defined, defaulting", "inputCodec", defaultAudioInputCodec)
+			c.InputCodec = defaultAudioInputCodec
+		default:
+			c.Logger.Log(logger.Info, pkg+"no input codec defined, defaulting", "inputCodec", defaultInputCodec)
+			c.InputCodec = defaultInputCodec
+			c.Logger.Log(logger.Info, pkg+"defaulting quantization", "quantization", defaultQuantization)
+			c.Quantization = defaultQuantization
+		}
 	default:
 		return errors.New("bad input codec defined in config")
 	}
@@ -285,6 +292,26 @@ func (c *Config) Validate(r *Revid) error {
 		c.SampleRate = defaultSampleRate
 	}
 
+	if c.Channels == 0 {
+		c.Logger.Log(logger.Info, pkg+"no number of channels defined, defaulting", "Channels", defaultChannels)
+		c.Channels = defaultChannels
+	}
+
+	if c.BitDepth == 0 {
+		c.Logger.Log(logger.Info, pkg+"no bit depth defined, defaulting", "BitDepth", defaultBitDepth)
+		c.BitDepth = defaultBitDepth
+	}
+
+	if c.RecPeriod == 0 {
+		c.Logger.Log(logger.Info, pkg+"no record period defined, defaulting", "recPeriod", defaultRecPeriod)
+		c.RecPeriod = defaultRecPeriod
+	}
+
+	if c.WriteRate == 0 {
+		c.Logger.Log(logger.Info, pkg+"no write rate defined, defaulting", "writeRate", defaultWriteRate)
+		c.WriteRate = defaultWriteRate
+	}
+
 	if c.Bitrate == 0 {
 		c.Logger.Log(logger.Info, pkg+"no bitrate defined, defaulting", "bitrate", defaultBitrate)
 		c.Bitrate = defaultBitrate