diff --git a/internal/cat/tci_audio.go b/internal/cat/tci_audio.go
index 882ee39..844ebf4 100644
--- a/internal/cat/tci_audio.go
+++ b/internal/cat/tci_audio.go
@@ -81,8 +81,8 @@ type tciAudio struct {
 	samples int64
 	peak    float64
 	peakAt  time.Time
-	probe   int
-	lastErr string
+	probeByType map[int]int
+	lastErr     string
 	// widthLogged keeps the one-line note about the sample width to once a
 	// session — it is a fact about the radio, not an event.
 	widthLogged bool
@@ -110,7 +110,6 @@ func (t *TCI) StartTCIAudio(rx, rate int) error {
 	t.audio.rx = rx
 	t.audio.rate = rate
 	t.audio.frames, t.audio.samples, t.audio.peak = 0, 0, 0
-	t.audio.probe = 0
 	t.audio.lastErr = ""
 	t.audio.mu.Unlock()
 
@@ -182,10 +181,20 @@ func (t *TCI) handleBinary(data []byte) {
 	length := int(le.Uint32(data[20:]))
 	stype := int(le.Uint32(data[24:]))
 
+	// Counted PER STREAM TYPE, not overall.
+	//
+	// A single counter was spent on the first forty receive-audio frames, which
+	// arrive twenty-four times a second — so a transmit-chrono or transmit-audio
+	// frame, the two this needs to see before the voice keyer can be written,
+	// would never have been logged at all. They only appear once the operator
+	// keys the radio, long after any global budget is gone.
 	t.audio.mu.Lock()
-	probe := t.audio.probe
+	if t.audio.probeByType == nil {
+		t.audio.probeByType = map[int]int{}
+	}
+	probe := t.audio.probeByType[stype]
 	if probe < tciAudioProbeMax {
-		t.audio.probe++
+		t.audio.probeByType[stype]++
 	}
 	t.audio.mu.Unlock()
 	if probe < tciAudioProbeMax {
@@ -194,7 +203,11 @@ func (t *TCI) handleBinary(data []byte) {
 	}
 
 	if stype != tciStreamRXAudio {
-		return // IQ, TX audio echo, chrono: not this file's business yet
+		// IQ, transmit audio, chrono. Nothing consumes them yet — but the chrono
+		// frames are what a voice keyer over TCI would have to answer, and their
+		// size and cadence cannot be guessed from the documentation. They are
+		// logged (per type, see above) and dropped.
+		return
 	}
 	if codec != 0 {
 		t.audioErr(fmt.Sprintf("stream is codec=%d, and nothing here decodes a compressed stream", codec))