Helix can load and store up to 128 IRs at a time. 48kHz, 16-bit, mono, .WAV type IRs of up to 2,048 samples are natively supported. But the Helix app allows you to import IR. WAV files of different samplerate, bitdepth, lengthandstereoformat, andthe app will convert these attributes automatically before sending to the Helix hardware.
Вот что сказано в мануале про импульсы.