[ˈɓæ.ɹˠəˌweʑ.iŋˠ]

Partial raising of low vowel before a high vowel.

Velarization, as I've always understood it, is basically raising the vellum as in [w] or as in a syllable-final [l] in English. I always start with one of those and then try to keep the vellum raised afterwards in order to imitate a velarized consonant.

[ˈɓæ.ɰəˌweʑ.iŋˠ]

ɹˠ > ɰ

Stress shift to penult.

[ˌɓæ.ɰəˈweʑ.iŋˠ]

[ˌɓæ.ɰəˈweʑ.ĩɯ̃]

iŋˠ > ĩɯ̃

Doesn't that violate the rule on multiple changes? It looks to me like what you have here is nasalisation of /i/ followed by "unstopping" of /ŋ/.

Good point. I did not realize.

[ˌmæ.ɰəˈweʑ.iŋˠ]

ɓ > m

Unstopping of nasals:

[ˌw̃æ.ɰəˈweʑ.iɰ̃]

[ˌwæ.ɰəˈweʑ.iɰ]

Denasalization of approximants.

Bastard!

[ˌʊ̯æ.ɯ̯̽əˈʊ̯eʑ.iɯ̯̽]
All semivowels become non-syllabic vowels!