In our quest to capture the pure sound of trees in true spatial quiet, we have without realising it, been following a long and winding path that has ultimately led us here. The Kielder Forest. It's a remote place for England. A place where the sound of trees can properly be felt and heard. A place where millions upon millions of trees grow together, across an area of 250 square miles (400 square kilometres). 
Planning this recording trip involved OS Explorer map OL42. We also checked flight paths and road maps to try to guess what extent human made noise might filter into the forest. From the sparse few roads and giant area of uninhabited nothingness, the location looked on-paper like a very quiet place indeed. Ideal we hoped for capturing the real sound of trees, in high definition audio.
When we say the 'real sound of trees', we mean the spatial sound of trees in an ever undulating wind. Wind that shifts in strength between soft to medium. Ideally with most variations around the 10 to 20 knot range and that peaks every now and then with slowly rising and slowly falling currents in the 25 to 30 knot range. For the spatial aspect, the trees need to be over a very wide area, and very tall. To be spruce and fir, because these make the sound-feel that we are most interested in. Evocative deep brown hushing.  
Somewhat optimistic for these very particular conditions, we travelled up country and ventured deep into the forest. We found a location near the dam of Kielder Water, and in driving rain left the Lento box tied to a tree. Then returned to the village some way outside the forest to stay the night. It always feels strange to leave the box behind, alone in such a vast place. Now we are home and listening back, what it captured is magical to us. Here is the period of time from 3am to just before 4am when the majority of spring birds begin to sing in first light. The wind strengths aren't strong, but there is an undulating wind that can be clearly heard in the tall spruce and fir trees as the banks of wind move across this region of the forest. Echoes of owls can be heard too, distant geese and a strange barking which we can't quite identify. Delicate layers of bird song gradually begin to build as the time approaches 4am. 
* As always with Lento listen with headphones or Airpods to properly hear the full range of aural qualities we strive to capture and share.