You can search for identifiers within the package.
in-package search v0.2.0
llama.low_level
Llama_low_level.Midi_input
type t
val create : unit -> t
val get_num_ports : t -> int
val port_names : t -> string list
val port_connect : t -> int -> unit
val port_drain_messages_to_char_array : t -> char array