Index: main/dsp.c
===================================================================
--- main/dsp.c	(revision 244325)
+++ main/dsp.c	(working copy)
@@ -990,10 +990,10 @@
 				} else if (hz[HZ_950] > TONE_MIN_THRESH * TONE_THRESH) {
 					newstate = DSP_TONE_STATE_SPECIAL1;
 				} else if (hz[HZ_1400] > TONE_MIN_THRESH * TONE_THRESH) {
-					if (dsp->tstate == DSP_TONE_STATE_SPECIAL1)
+					if (dsp->tstate == DSP_TONE_STATE_SPECIAL1 || dsp->tstate == DSP_TONE_STATE_SPECIAL2)
 						newstate = DSP_TONE_STATE_SPECIAL2;
 				} else if (hz[HZ_1800] > TONE_MIN_THRESH * TONE_THRESH) {
-					if (dsp->tstate == DSP_TONE_STATE_SPECIAL2) {
+					if (dsp->tstate == DSP_TONE_STATE_SPECIAL2 || dsp->tstate == DSP_TONE_STATE_SPECIAL3) {
 						newstate = DSP_TONE_STATE_SPECIAL3;
 					}
 				} else if (dsp->genergy > TONE_MIN_THRESH * TONE_THRESH) {