| Module | Name | Default | Description |
| HPARM | SOURCEFORMAT | HTK | File format of source |
| HWAVE | TARGETFORMAT | HTK | File format of target |
| HLABEL HAUDIO HWAVE HPARM | SOURCERATE | 0.0 | Sample rate of source in 100ns units |
| HPARM HWAVE | TARGETRATE | 0.0 | Sample rate of target in 100ns units |
| LINEOUT | T | Enable audio output to machine line output | |
| PHONESOUT | T | Enable audio output to machine phones output | |
| HAUDIO | SPEAKEROUT | F | Enable audio output to machine internal speaker |
| LINEIN | T | Enable audio input from machine line input | |
| MICIN | F | Enable audio input from machine mic input | |
| NSAMPLES | Num samples in alien file input via a pipe | ||
| HWAVE | HEADERSIZE | Size of header in an alien file | |
| BYTEORDER | Define byte order VAX or other | ||
| STEREOMODE | Select channel: RIGHT or LEFT | ||
| SOURCEKIND | ANON | Parameter kind of source | |
| TARGETKIND | ANON | Parameter kind of target | |
| SAVECOMPRESSED | F | Save the output file in compressed form | |
| SAVEWITHCRC | T | Attach a checksum to output parameter file | |
| HPARM | ADDDITHER | 0.0 | Level of noise added to input signal |
| ZMEANSOURCE | F | Zero mean source waveform before analysis | |
| WINDOWSIZE | 256000.0 | Analysis window size in 100ns units | |
| USEHAMMING | T | Use a Hamming window | |
| PREEMCOEF | 0.97 | Set pre-emphasis coefficient | |
| LPCORDER | 12 | Order of lpc analysis | |
| NUMCHANS | 20 | Number of filterbank channels | |
| LOFREQ | -1.0 | Low frequency cut-off in fbank analysis | |
| HIFREQ | -1.0 | High frequency cut-off in fbank analysis | |
| HLABEL HPARM | V1COMPAT | F | HTK V1 compatibility setting |
| Module | Name | Default | Description |
| HWAVE | NATURALREADORDER | F | Enable natural read order for binary files |
| HSHELL | NATURALWRITEORDER | F | Enable natural write order for binary files |
| USEPOWER | F | Use power not magnitude in fbank analysis | |
| NUMCEPS | 12 | Number of cepstral parameters | |
| CEPLIFTER | 22 | Cepstral liftering coefficient | |
| ENORMALISE | T | Normalise log energy | |
| ESCALE | 0.1 | Scale log energy | |
| SILFLOOR | 50.0 | Energy silence floor in dBs | |
| DELTAWINDOW | 2 | Delta window size | |
| ACCWINDOW | 2 | Acceleration window size | |
| VQTABLE | NULL | Name of VQ table | |
| SIMPLEDIFFS | F | Use simple differences for delta calculations | |
| RAWENERGY | T | Use raw energy | |
| AUDIOSIG | 0 | Audio signal number for remote control | |
| USESILDET | F | Enable speech/silence detector | |
| MEASURESIL | T | Measure background silence level | |
| HPARM | OUTSILWARN | T | Print a warning message to stdout before measuring audio levels |
| SPEECHTHRESH | 9.0 | Threshold for speech above silence level (in dB) | |
| SILENERGY | 0.0 | Average background noise level (in dB) - will normally be measured rather than supplied in configuration | |
| SPCSEQCOUNT | 10 | Window over which speech/silence decision reached | |
| SPCGLCHCOUNT | 0 | Maximum number of frames marked as silence in window which is classified as speech whilst expecting start of speech | |
| SILSEQCOUNT | 100 | Number of frames classified as silence needed to mark end of utterance | |
| SILGLCHCOUNT | 2 | Maximum number of frames marked as silence in window which is classified as speech whilst expecting silence | |
| SILMARGIN | 40 | Number of extra frames included before and after start and end of speech marks from the speech/silence detector |
| Module | Name | Default | Description |
| STRIPTRIPHONES | F | Enable triphone stripping | |
| TRANSALT | 0 | Filter all but specified label alternative | |
| HLABEL | TRANSLEV | 0 | Filter all but specified label level |
| LABELSQUOTE | NULL | Select method for quoting in label files | |
| SOURCELABEL | HTK | Source label format | |
| TARGETLABEL | HTK | Target label format | |
| HMEM | PROTECTSTAKS | F | Enable stack protection |
| CHKHMMDEFS | T | Check consistency of HMM defs | |
| SAVEBINARY | F | Save HMM defs in binary format | |
| KEEPDISTINCT | F | Keep orphan HMMs in distinct files | |
| HMODEL | SAVEGLOBOPTS | T | Save  o with HMM defs |
| ORPHANMACFILE | NULL | Last resort file for new macros | |
| HMMSETKIND | NULL | Kind of HMM Set | |
| ALLOWOTHERHMMS | T | Allow MMFs to contain HMM definitions which are not listed in the HMM List | |
| DISCRETELZERO | F | Map DLOGZERO to LZERO in output probability calculations | |
| FORCECXTEXP | F | Force triphone context expansion to get model names (is overridden by ALLOWCXTEXP) | |
| FORCELEFTBI | F | Force left biphone context expansion to get model names ie. don't try triphone names | |
| FORCERIGHTBI | F | Force right biphone context expansion to get model names ie. don't try triphone names | |
| HNET | ALLOWCXTEXP | T | Allow context expansion to get model names |
| ALLOWXWRDEXP | F | Allow context expansion across words | |
| FACTORLM | F | Factor language model likelihoods throughout words rather than applying all at transition into word. This can increase accuracy when pruning is tight and language model likelihoods are relatively high. | |
| CFWORDBOUNDARY | T | In word-internal triphone systems, context-free phones will be treated as word boundaries | |
| HREC | FORCEOUT | F | Forces the most likely partial hypothesis to be used as the recognition result even when no token reaches the end of the network by the last frame of the utterance |
| ABORTONERR | F | Causes HError to abort rather than exit | |
| HSHELL | NONUMESCAPES | F | Prevent writing in 012 format |
| MAXTRYOPEN | 1 | Maximum number of attempts which will be made to open the same file | |
| MAXCLUSTITER | 10 | Maximum number of cluster iterations | |
| HTRAIN | MINCLUSTSIZE | 3 | Minimum number of elements in any one cluster |
| BINARYACCFORMAT | T | Save accumulator files in binary format | |
| TRACE | 0 | Trace setting |