Custom Trigger Wake Word doesn't work

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Output of the audio debugging script.

Your OS (including version) where you are running AlexaPi:

Raspberry Pi OS Stretch 
VERSION_ID : "9"
VERSION = "9" (Stretch) 

Your hardware platform and model you are running on:

Raspberry Pi Model B

Python release (python2 --version):

Python 2.7.13

Description of problem:

Aim : To change wake word from "alexa" to "something of my choice".  

Expected:

Pi should start responding to custom wake word set by me in the config.yaml file. 

Problem-relevant config.yaml entries:

Yes. 
pocketsphinx:
enabled: true
voice_confirm: true

phrase: "tom"
threshold: 1e-10

Steps to reproduce:

1. sudo nano etc/opt/AlexaPi/config.yaml
2. Edit the phrase in the file
3. Reboot the Pi or use sudo systemctl start AlexaPi.service

Traceback (if applicable):

Additional info:

I believe this can be done by modifying the "phrase " option in config.yaml file. This was suggested in one of the issues. I modified the wake word in config.yaml file and restarted the Pi but it didn't work after that. 

[renekliment]

https://github.com/alexa-pi/AlexaPi/wiki/Triggers#voice-triggers Read up. Try tweaking the threshold.

[E3V3A]

Try with 3 syllable words. Obviously things like “Tom” is just one and become problematic with other words. I would try with words like: Tomato (toh-ma-toh), capito (kah-pi-toh) etc. Or perhaps kapito since c can be pronounced differently as in citrus and cook.