function P = recorder_defaults()
% RECORDER_DEFAULTS Default parameters, mirroring the web app's params.ts.
% A soprano (descant) recorder in C. The output duration is not a parameter:
% it is note_count * note_dur_s + (note_count - 1) * gap_ms + tail_s.

% Bore (window at x = 0, open foot at x = bore_length_m)
P.bore_length_m = 0.3015;
P.bore_r_head_m = 0.0067;
P.bore_r_foot_m = 0.0052;
P.wall_m = 0.003;
P.hole_scale = 1.0;
P.thumb_pinch = 0.35;
P.pinch_loss = 0.5;

% Window, windway, and jet
P.cutup_m = 0.0045;        % flue exit to labium (window length along the bore)
P.window_width_m = 0.010;
P.flue_h_m = 0.0010;       % flue exit height
P.flue_w_m = 0.010;        % flue exit width
P.labium_offset_m = 0.0004;
P.jet_gain = 1.0;          % receptivity trim
P.jet_growth = 0.4;        % instability growth per flue height of travel
P.jet_conv = 0.55;         % jet wave speed as a fraction of Uj
P.jet_stcut = 0.45;        % jet instability cutoff, Strouhal-like: f_c = jet_stcut Uj / W
P.vortex_loss = 1.0;       % nonlinear mouth loss coefficient
P.noise_level = 0.03;      % turbulence displacement noise on the jet
P.direct_gain = 1.0;

% Breath and gesture
P.breath_pa = 350.0;       % blowing pressure for C5; higher notes track up
P.breath_track = 1.6;      % pressure grows as (f_note / 523.25)^breath_track
P.attack_ms = 12.0;
P.release_ms = 25.0;
P.vibrato_hz = 5.0;
P.vibrato_depth = 0.0;
P.note_count = 1;          % 1..3
P.note1 = 5;               % index into the fingering chart: 5 = G5
P.note2 = 6;               % A5
P.note3 = 7;               % B5
P.note_dur_s = 1.6;
P.gap_ms = 60.0;
P.seed = 1;

% Modal fit
P.max_mode_hz = 10000.0;
P.max_modes = 12;
P.grid_hz = 2.5;

% Radiation / listener (window at the origin, foot along -y, holes toward +z)
P.listener_x_m = 0.25;
P.listener_y_m = -0.10;
P.listener_z_m = 0.35;
P.speed_of_sound = 343.0;
P.air_density = 1.204;

% Rendering / output
P.sample_rate = 48000;
P.oversample = 2;
P.tail_s = 0.4;
P.pre_delay_ms = 3.0;
P.normalize = 1;
P.peak_dbfs = -3.0;
P.full_scale_pa = 0.5;
end