I heard the Buff-breasted Babbler (Trichastoma tickelli tickelli) at a number of locations but spotting this under-growth specialist was tough. Rarely shows itself, and that in dark environments (image ISO 5,000-10,000).
The classical calls are easily identified once learnt and an audio recording, waveform and sonogram are shown below.
Calls are described as “pii-tiyu” or “pii-tyu” by Wells 2007 (below).
Also see: Wells, D.R., P. Andrew & A.B. van den Berg. 2001. Systematic notes on Asian birds. 21. Babbler jungle: a reevaluation of the ‘pyrrogenys’ group of Asian pellorneines (Timaliidae). Zool. Verh. Leiden 335, 10.xii.2001: 235-254, figs 1-2.— ISSN 0024-1652 (available online).
Amar-Singh HSS (Dato’ Dr)
Ipoh, Perak, Malaysia
Location: Fraser’s Hill, Pahang, Malaysia
Habitat: 1300 m ASL, primary montane jungle
Date: 19-20th November 2018
Equipment: Nikon D500 SLR with Tamron SP 150-600mm f/5-6.3 Di VC USD, handheld