I have overlooked the most obvious example (for me) of gamba - cello pairing, obvious because of my deep fascination of this composer's music and his personality: Charpentier's  Sonata a Huit (H548). 

Below is a performance of the section where the gamba is accompanied by a 'basse de violon a cinq corde', followed by a recit of the same accompanied by the gamba:

Recit de la viole seule

Recit de la basse de violon

Charpentier's ingenious device in highlighting each of the instrument's strengths include the use of multiple stops in the high ranges of the gamba, giving it a typically elegant dance, the Sarabande, following its recit; and giving a more flamboyant, sprezzatura type recitative to the cello followed by a very sprightly, uplifting bouree.