I found this,
Private
Rifleman
Bugler
Chosen Man (a distiction as opposed to rank)
Corporal
Corporal Bugler
Serjeant
Serjeant Bugler
Armourer (Sjt, grey uniform, green fleathering)
Quartermaster Sjt ( 4x Stripes plain cloth, mentioned as Staff Serjeant)
Paymaster (same as above)
Bugle Major (4x stripes plain cloth)
Colour Serjeant (1813 onwards)
Company Serjeant Major (4x Stripes silver lace, Company Adjutant)
Battalion Serjeant Major (4x stripes silver lace, Battalion Adjutant)
Regimental Serjeant Major (4x stripes silver lace, Regimental Adjutant)