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[mikhail]

in global vars

  Fade:BASS_BFX_VOLUME_ENV;
  node: array of BASS_BFX_ENV_NODE;
  fx_vol: integer;

setting fx

  SetLength(node, 4);
  node[0].pos:=0.0;
  node[0].val:=1;
  node[1].pos:=BASS_ChannelBytes2Seconds(AudioChannel, Trunc(GraphDisplay3D1.Items.Item[0].SelectionStart));
  node[1].val:=1;
  node[2].pos:=BASS_ChannelBytes2Seconds(AudioChannel, Trunc(GraphDisplay3D1.Items.Item[0].SelectionStart))+0.1;
  node[2].val:=0;
  node[3].pos:=BASS_ChannelBytes2Seconds(AudioChannel, Trunc(GraphDisplay3D1.Items.Item[0].SelectionEnd));
  node[3].val:=1;
  fade.lChannel:=BASS_BFX_CHANALL;
  fade.lNodeCount:=4;
  fade.pNodes:=@node;
  fade.bFollow:=True;
  BASS_FXSetParameters(fx_vol, @fade);

bass error - ILLPARAM, but when i create this fx locally this code working

[Ian @ un4seen]

Please confirm what each node's "pos" value is. One possible reason for a BASS_ERROR_ILLPARAM error is if a node's position is lower than the previous node's position.