Three times heard,strong two note piping series swelling in volume,the last one recorded without starting softer notes,ending in a Buff-necked Woodpecker drumming right overhead.Nothing similiar heard the last weeks here.Species flushed and heard three years ago beyond Waterfall turn-off 6 km northwards.Not sure because recordings on Internet are softer,slower and not swelling in volume.
Batek 'kaldus'
I meant to write "banded langur" but it defaults to "banded surili" for this species.