Hi Erica,
HHEd has "TR" command to control log levels. Here are log levels related to clustering.
#define T_CLUSTERS 0x0100 /* Show contents of clusters */
#define T_QST 0x0200 /* Show items specified by questions */
#define T_TREE_ANS 0x0400 /* Trace best unseen triphone tree filtering */
#define T_TREE_BESTQ 0x0800 /* Trace best question for splitting each node */
#define T_TREE_BESTM 0x1000 /* Trace best merge of terminal nodes */
#define T_TREE_OKQ 0x2000 /* Trace all questions exceeding threshold */
#define T_TREE_ALLQ 0x4000 /* Trace all questions */
#define T_TREE_ALLM 0x8000 /* Trace all possible merges */
So if you run
TR 2049
(2049 = 0x0801) just before TB commands, (hopefully) HTS will output both normal log plus best questions at each node. Likewise, if you turn on T_TREE_ALL_Q, it will generate log for all questions. You can try other values or just comment-out related lines in the HHEd.c:ValidProbNode() to generate this information.
Cheers,
Heiga