HHEd  in version 3.4 gives me the warning 'No mixtures to increase'
and the resulting hmms are identical with the original ones. In
version 3.3, for the exact same command, the resulting hmms have the
number of mixtures increased.

Am I doing something wrong?

HHEd -V -T 1 -H hmm5/macros -H hmm5/hmmdefs -H hmm5/hmmsp -M hmm6
incmix3.hed phone_list1

HTK Version Information
Module     Version    Who    Date      : CVS Info
HHEd       3.3        CUED   28/04/05  : $Id: HHEd.c,v 1.3 2005/07/22
10:17:13 mjfg Exp $
HShell     3.3        CUED   28/04/05  : $Id: HShell.c,v 1.2
2005/05/12 15:51:24 jal58 Exp $
HMem       3.3        CUED   28/04/05  : $Id: HMem.c,v 1.1.1.1
2005/05/12 10:52:50 jal58 Exp $
HLabel     3.3        CUED   28/04/05  : $Id: HLabel.c,v 1.2
2005/05/12 15:51:24 jal58 Exp $
HMath      3.3        CUED   28/04/05  : $Id: HMath.c,v 1.1.1.1
2005/05/12 10:52:50 jal58 Exp $
HSigP      3.3        CUED   28/04/05  : $Id: HSigP.c,v 1.1.1.1
2005/05/12 10:52:51 jal58 Exp $
HWave      3.3        CUED   28/04/05  : $Id: HWave.c,v 1.1.1.1
2005/05/12 10:52:52 jal58 Exp $
HAudio     3.3        CUED   28/04/05  : $Id: HAudio.c,v 1.2
2005/05/12 15:51:23 jal58 Exp $
HVQ        3.3        CUED   28/04/05  : $Id: HVQ.c,v 1.1.1.1
2005/05/12 10:52:52 jal58 Exp $
HModel     3.3        CUED   28/04/05  : $Id: HModel.c,v 1.4
2005/07/22 10:17:01 mjfg Exp $
HParm      3.3        CUED   28/04/05  : $Id: HParm.c,v 1.2 2005/07/22
10:17:02 mjfg Exp $
HUtil      3.3        CUED   28/04/05  : $Id: HUtil.c,v 1.2 2005/07/22
10:17:02 mjfg Exp $

HHEd
 41/41 Models Loaded [5 states max, 1 mixes max]

MU 3 {}
 Mixup to 3 components per stream
 WARNING [-2637]  HeaviestMix: mix 1 in sp has v.small gConst
[71.677208] in HHEd
 MU: Number of mixes increased from 122 to 366

Saving new HMM files ...
Edit Complete



HHEd -V -T 1 -H hmm5/macros -H hmm5/hmmdefs -H hmm5/hmmsp -M hmm6
incmix3.hed phone_list1

HTK Version Information
Module     Version    Who    Date      : CVS Info
HHEd       3.4        CUED   25/04/06  : $Id: HHEd.c,v 1.38 2007/10/10
04:26:11 zen Exp $
HShell     3.4        CUED   25/04/06  : $Id: HShell.c,v 1.8
2007/09/18 12:20:45 zen Exp $
HMem       3.4        CUED   25/04/06  : $Id: HMem.c,v 1.5 2007/10/03
07:20:14 zen Exp $
HLabel     3.4        CUED   25/04/06  : $Id: HLabel.c,v 1.5
2007/09/18 12:20:43 zen Exp $
HMath      3.3        CUED   28/04/05  : $Id: HMath.c,v 1.8 2007/10/02
11:54:38 zen Exp $
HSigP      3.4        CUED   25/04/06  : $Id: HSigP.c,v 1.3 2007/09/18
12:20:45 zen Exp $
HWave      3.4        CUED   25/04/06  : $Id: HWave.c,v 1.4 2007/09/18
12:20:45 zen Exp $
HAudio     3.4        CUED   25/04/06  : $Id: HAudio.c,v 1.4
2007/09/18 12:20:43 zen Exp $
HVQ        3.4        CUED   25/04/06  : $Id: HVQ.c,v 1.3 2007/09/18
12:20:45 zen Exp $
HModel     3.4        CUED   25/04/06  : $Id: HModel.c,v 1.20
2007/10/03 07:20:13 zen Exp $
HParm      3.4        CUED   25/04/06  : $Id: HParm.c,v 1.7 2007/09/18
12:20:45 zen Exp $
HUtil      3.4        CUED   25/04/06  : $Id: HUtil.c,v 1.12
2007/09/18 12:20:45 zen Exp $
HAdapt     3.4        CUED   25/04/06  : $Id: HAdapt.c,v 1.32
2007/10/03 07:20:13 zen Exp $

HHEd
 41/41 Models Loaded [5 states max, 1 mixes max]

MU 3 {}
 Mixup to 3 components per stream
 WARNING [-2631]  MixUpCommand: No mixtures to increase! in HHEd

Saving new HMM files ...
Edit Complete